Chore: Upgrades rxjs to 7.3.0 (#37913)

* Chore: upgrades rxjs to 7.3.0

* Chore: replaces toPromise with lastValueFrom

* Chore: removes unused mock that caused test error

* Chore: fixes build error in PieChartPanel

* Chore: fixed build error in requestAllIndices

* Chore: fixes comment

* Chore: trying to reduce docs errors

* Chore: searches for explicit api extractor warnings

* Chore: updates rxjs-spy to 8.0.0

* Chore: reverts to main

* Chore: upgrade rxjs and rxjs-spy

package.json

@@ -195,7 +195,7 @@
     "redux-mock-store": "1.5.4",
     "regexp-replace-loader": "1.0.1",
     "rimraf": "3.0.1",
-    "rxjs-spy": "^7.5.1",
+    "rxjs-spy": "8.0.0",
     "sass": "1.27.0",
     "sass-lint": "1.12.1",
     "sass-loader": "8.0.2",
@@ -297,7 +297,7 @@
     "regenerator-runtime": "0.13.3",
     "reselect": "4.0.0",
     "rst2html": "github:thoward/rst2html#990cb89",
-    "rxjs": "6.6.3",
+    "rxjs": "7.3.0",
     "search-query-parser": "1.5.4",
     "semver": "^7.1.3",
     "slate": "0.47.8",