Fix to the jest test - FilterLabel should render properly

[ana-davydova]

Resolves #253320

This is a follow-up to #262207.

Fix

Three changes to filter_label.test.tsx:

1. jest.setTimeout(10 * 1000) → jest.setTimeout(30 * 1000) — gives enough headroom on stressed CI agents.
2. Replaced waitFor(() => getByText(...)) with await screen.findByText(...) — copies the pattern used by the non-flaky should display invert filter sibling test.
3. Re-enabled the suite.

Verification

• 155/155 consecutive local runs pass, 0 failures.
  Buildkite flaky-test-runner doesn't cover jest tests, so local runs are the only option.

Made with Claude.

[macroscopeapp]

Approvability

Verdict: Would Approve

Test-only changes that re-enable a previously skipped test and refactor assertions to use idiomatic testing-library patterns. No runtime code is affected, and the author is the designated code owner of the modified file.

^{Macroscope would have approved this PR. A repo admin can enable approvability here.}

[kibanamachine]

💚 Build Succeeded

• Buildkite Build
• Commit: c926865

Metrics [docs]

✅ unchanged

[miguelmartin-elastic]

I was working on a failing test for this same plugin and component a few weeks ago. I couldn't make it fail locally nor in the CI: #253605

I also tried increasing the timeout but that didn't work either. Just a heads-up that this one may fail too when merged to main (hope not!), so we should keep an eye on it once it's merged @ana-davydova

[miguelmartin-elastic]

See comment above 😃

[kibanamachine]

Starting backport for target branches: 9.3, 9.4

https://github.com/elastic/kibana/actions/runs/25001083411

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	9.3
✅	9.4

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation

[kibanamachine]

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[kibanamachine]

Looks like this PR has backport PRs but they still haven't been merged. Please merge them ASAP to keep the branches relatively in sync.
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[kibanamachine]

Looks like this PR has backport PRs but they still haven't been merged. Please merge them ASAP to keep the branches relatively in sync.
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[kibanamachine]

Looks like this PR has backport PRs but they still haven't been merged. Please merge them ASAP to keep the branches relatively in sync.
cc: @ana-davydova

[kibanamachine]

Looks like this PR has backport PRs but they still haven't been merged. Please merge them ASAP to keep the branches relatively in sync.
cc: @ana-davydova