add more e2e tests for offset feature (#47628)

* add offset e2e tests

* mark test not flaky

* add basic tests

* add more tests

* WIP

* working version

* cleanup

* oops

* improve naming

* fix test

* improve formatting

* update comment and ts

* add a test for metric

* space

* update tests and create a new issue

* add one more test

* re-enable test

* make imports consistent

* rewrite tests to put data through UI