[Search] test(es3): ensure index management index details shown

[TattdCodeMonkey]

Summary

Re-added the serverless search specific index management tests so that we can ensure the index details page is rendered correctly when the search indices plugin feature flag is disabled.

This test will be replaced by index_details tests when the feature flag is enabled, but until that is the default behavior this test ensure we have full coverage for the user experience.

Checklist

• Unit or functional tests were updated or added to match the most common scenarios
• Flaky Test Runner was used on any tests changed

[kibanamachine]

Flaky Test Runner Stats

🎉 All tests passed! - kibana-flaky-test-suite-runner#7139

[✅] x-pack/test_serverless/functional/test_suites/search/config.ts: 25/25 tests passed.

see run history

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 74e68ce

Failed CI Steps

• Jest Tests #12

Test Failures

• [job] [logs] Jest Tests #12 / edit package policy page modify agent policies should create agent policy with sys monitoring when new agent policy button is clicked
• [job] [logs] Jest Tests #12 / edit package policy page modify agent policies should not remove managed policy when policies are modified
• [job] [logs] Jest Tests #12 / edit package policy page should disable submit button on invalid form with empty package var
• [job] [logs] Jest Tests #12 / edit package policy page should navigate on submit
• [job] [logs] Jest Tests #12 / edit package policy page should show generic error on other statusCode on submit
• [job] [logs] Jest Tests #12 / edit package policy page should show out of date error on 409 statusCode on submit

Metrics [docs]

✅ unchanged