Tests: Adds expects for observables (#28929)

* Tests: Adds expects for observables

* Refactor: renames matcher

* Chore: changed jest version and removed as dev dependency

* Refactor: Changes after PR review

* wip

* Chore: revert

* Chore: Adds jest-matcher-utils

* Chore: fixed merge error

* Tests: Removed inline snapshots as they are env dependent

* Tests: missed a snapshot

* Refactor: Removed type file after PR comments

tsconfig.json

@@ -19,6 +19,7 @@
     "public/e2e-test/**/*.ts",
     "public/test/**/*.ts",
     "public/vendor/**/*.ts",
-    "packages/jaeger-ui-components/typings"
+    "packages/jaeger-ui-components/typings",
+    "packages/grafana-data/typings"
   ]
 }