Revert "Fix check for user exec command (#3664)" (#3827)

This reverts commit 056b818ceb.

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

package.json

@@ -185,7 +185,6 @@
     "@kubernetes/client-node": "^0.15.1",
     "@sentry/electron": "^2.5.0",
     "@sentry/integrations": "^6.10.0",
-    "@types/which": "^2.0.1",
     "abort-controller": "^3.0.0",
     "array-move": "^3.0.1",
     "auto-bind": "^4.0.0",
@@ -194,6 +193,7 @@
     "byline": "^5.0.0",
     "chalk": "^4.1.0",
     "chokidar": "^3.4.3",
+    "command-exists": "1.2.9",
     "conf": "^7.0.1",
     "crypto-js": "^4.1.1",
     "electron-devtools-installer": "^3.2.0",
@@ -246,7 +246,6 @@
     "tempy": "^0.5.0",
     "url-parse": "^1.5.1",
     "uuid": "^8.3.2",
-    "which": "^2.0.2",
     "win-ca": "^3.2.0",
     "winston": "^3.3.3",
     "winston-console-format": "^1.0.8",