KubeObjectStore & KubeWatchApi fixes and optimizations (#2063)

* Detach NamespaceStore from KubeWatchApi, proper KubeObjectStore.loadAll (rebase of #2033)

Signed-off-by: Roman <ixrock@gmail.com>

* Watch-api requests optimization (#2066)

* subscribe for watching resources in single request when has admin-like access rights

Signed-off-by: Roman <ixrock@gmail.com>

* responding to comments

Signed-off-by: Roman <ixrock@gmail.com>

* fix unit-tests

Signed-off-by: Roman <ixrock@gmail.com>

* fix: reloading stores when preloading enabled and waitUntilLoaded=false

Signed-off-by: Roman <ixrock@gmail.com>

* mark Cluster.canUseWatchApi() and Cluster.refreshAccessibility() as private

Signed-off-by: Roman <ixrock@gmail.com>

* fix unit test: make public Cluster.canUseWatchApi()

Signed-off-by: Roman <ixrock@gmail.com>

* responding to comments in #2066

Signed-off-by: Roman <ixrock@gmail.com>

src/main/__test__/cluster.test.ts

@@ -126,6 +126,7 @@ describe("create clusters", () => {
     };
 
     jest.spyOn(Cluster.prototype, "isClusterAdmin").mockReturnValue(Promise.resolve(true));
+    jest.spyOn(Cluster.prototype, "canUseWatchApi").mockReturnValue(Promise.resolve(true));
     jest.spyOn(Cluster.prototype, "canI")
       .mockImplementation((attr: V1ResourceAttributes): Promise<boolean> => {
         expect(attr.namespace).toBe("default");