chore: use @web/test-runner instead of karma (#1816)

* chore: use `@web/test-runner` instead of `karma`

* remove karma config file

* prettier

* ts

* more ts

* remove one more dep

* maybe run browser test with node 18

* we need 16

* is json output enough?

* Revert "is json output enough?"

This reverts commit af20f6c.

* Revert "Revert "is json output enough?""

This reverts commit 6e3b6fe.

* Revert "Revert "Revert "is json output enough?"""

This reverts commit 11100a8.

* trigger ci

* chore: sync package-lock.json

* remove two unused deps

---------

Co-authored-by: Marc Pichler <marc.pichler@dynatrace.com>

.github/workflows/unit-test.yml

@@ -146,7 +146,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: ["14"]
+        node: ["16"]
     runs-on: ubuntu-latest
     env:
       NPM_CONFIG_UNSAFE_PERM: true