Make routes in back-end comply to Open Closed Principle (#4859)

* Make registration of back-end routes happen using injectable

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for list charts

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for get chart

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for get chart values

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for installing chart

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for updating release

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for rollbacking release

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for listing releases

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for getting release

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for getting release values

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for getting release history

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for deleting release

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Remove HelmRoute for not being used anymore

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for applying resource

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for patching resource

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for stopping current port forward

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for getting current port forward

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Consolidate start port forward route to use injection token for registering route

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for metrics

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for getting service account

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for getting version

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Add global override for reading file to make it not required where not interesting

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Switch to using injectable to setup route for serving static files

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make adding routes private for router

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make routes wait until all asynchronous stuff are done

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Introduce healthy abstraction between back-end routes and route handlers

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make response of route typed

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Fix incorrect return value of updateRelease

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make typing of routes support synchronous values

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make code cleaner

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Rename test for accuracy

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Add test for throwing route handler

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Remove duplicate license header

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Make mechanism of creating HTTP response an implementation detail

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Remove not needed properties from test

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Fix code style

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Fix typing and codestyle

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Fix typing error

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Fix merge conflicts

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Organize all router related files under directory

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

yarn.lock

@@ -9047,6 +9047,11 @@ merge2@^1.3.0:
   resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.4.1.tgz#4368892f885e907455a6fd7dc55c0c9d404990ae"
   integrity sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg==
 
+mergee@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/mergee/-/mergee-1.0.0.tgz#027c5addc650f6ecbe4bf56100bd00dae763fda7"
+  integrity sha512-hbbXD4LOcxVkpS+mp3BMEhkSDf+lTVENFeEeqACgjjL8WrgKuW2EyLT0fOHyTbyDiuRLZJZ1HrHNeiX4iOd79Q==
+
 methods@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
@@ -9290,6 +9295,13 @@ mock-fs@^5.1.2:
   resolved "https://registry.yarnpkg.com/mock-fs/-/mock-fs-5.1.2.tgz#6fa486e06d00f8793a8d2228de980eff93ce6db7"
   integrity sha512-YkjQkdLulFrz0vD4BfNQdQRVmgycXTV7ykuHMlyv+C8WCHazpkiQRDthwa02kSyo8wKnY9wRptHfQLgmf0eR+A==
 
+mock-http@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/mock-http/-/mock-http-1.1.0.tgz#b89380a718a103fc5801095804bedd0b20f7638c"
+  integrity sha512-H2HMGaHNQPWY8PdeEw4RFux2WEOHD6eJAtN3+iFELik5kGjPKAcoyPWcsC2vgDiTa2yimAEDssmMed51e+cBKQ==
+  dependencies:
+    mergee "^1.0.0"
+
 moment-timezone@^0.5.34:
   version "0.5.34"
   resolved "https://registry.yarnpkg.com/moment-timezone/-/moment-timezone-0.5.34.tgz#a75938f7476b88f155d3504a9343f7519d9a405c"