[TEST] Wait for internal inference indices to be created in authorization IT

[dimitris-athanasiou]

After #143866, this is a better attempt at fixing those tests.

ensureGreen calls the cluster _health API. With providing the index pattern, this returns green
when no matching index exists.

We actually want to ensure the inference indices are created. Calling the GET _inference API does that.

Closes #140849

[elasticsearchmachine]

Pinging @elastic/search-inference-team (Team:Search - Inference)

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📝 Walkthrough

Walkthrough

This pull request mutes four failing tests in AuthorizationTaskExecutorIT and updates the test class's initialization logic. The changes remove unused imports, modify the createComponents() method to declare throws Exception, and replace a synchronous ensureGreen call with an asynchronous assertBusy wait mechanism to verify that EIS endpoints exist during test setup.

Possibly related PRs

• PR #143866: Both PRs modify AuthorizationTaskExecutorIT's test setup to ensure inference system readiness, with related approaches to managing endpoint and index initialization timing.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR correctly addresses both linked issues by ensuring inference indices are created before tests run, eliminating timing-related intermittent failures.
Out of Scope Changes check	✅ Passed	All changes are scoped to test setup improvements: removing unused imports, updating method signatures, and adding async wait logic for inference indices.

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[dimitris-athanasiou]

@DonalEvans I've revamped this PR. Could you please take another look?