feat(Explore): make sure Loki labels are up to date (#16131)

* Migrated loki syntax and labels logic to useLokiSyntax hook

* Enable loki labels  refresh after specified interval has passed

* Enable periodic loki labels refresh when labels selector is opened

* Fix prettier

* Add react-hooks-testing-library and disable lib check on typecheck

* Add tests for loki syntax/label hooks

* Move tsc's skipLibCheck option to tsconfig for webpack to pick it up

* Set log labels refresh marker variable when log labels fetch start

* Fix prettier issues

* Fix type on activeOption in useLokiLabel hook

* Typo fixes and types in useLokiSyntax hook test fixes

* Make sure effect's setState is not performed on unmounted component

* Extract logic for checking if is component mounted to a separate hook

package.json

@@ -20,6 +20,7 @@
     "@types/angular": "^1.6.6",
     "@types/chalk": "^2.2.0",
     "@types/classnames": "^2.2.6",
+    "@types/clipboard": "^2.0.1",
     "@types/commander": "^2.12.2",
     "@types/d3": "^4.10.1",
     "@types/enzyme": "^3.1.13",
@@ -34,7 +35,6 @@
     "@types/react-select": "^2.0.4",
     "@types/react-transition-group": "^2.0.15",
     "@types/react-virtualized": "^9.18.12",
-    "@types/clipboard": "^2.0.1",
     "angular-mocks": "1.6.6",
     "autoprefixer": "^9.4.10",
     "axios": "^0.18.0",
@@ -95,6 +95,7 @@
     "postcss-loader": "^3.0.0",
     "postcss-reporter": "^6.0.1",
     "prettier": "1.16.4",
+    "react-hooks-testing-library": "^0.3.7",
     "react-hot-loader": "^4.3.6",
     "react-test-renderer": "^16.5.0",
     "redux-mock-store": "^1.5.3",