[TSVB] Unskips functional tests and fixes flakiness

[stratoula]

Summary

Closes #145563
Closes #145562
Closes #145561
Closes #145560
Closes #145644
Closes #139096
Closes #145564

They also fail for the same reason in FF. They started fail when a change made by the operations team.

For some reason while the list appears on the DOM the click by mouse doesn't work for the FF tests. I changed the helper a bit to not use it.

Runner for tests (50 times) to ensure that nothing has broken https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/1577#_

I couldn't run the firefox tests on the flaky runner (I get an error when initializing it) but these tests were failing every time we run them on FF locally I am quite optimistic that this change will stabilize them in FF too.

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 1ec21f1

Metrics [docs]

Unknown metric groups

ESLint disabled in files

id	before	after	diff
osquery	1	2	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
fleet	59	65	+6
osquery	109	115	+6
securitySolution	442	448	+6
total			+20

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	67	73	+6
osquery	110	117	+7
securitySolution	519	525	+6
total			+21

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@elasticmachine merge upstream

[elasticmachine]

Pinging @elastic/kibana-visualizations @elastic/kibana-visualizations-external (Team:Visualizations)

[dej611]

Code review only 👍