[ResponseOps][Scout] Migrate FTR → Scout: alert_deletion, edit_rule_flow, maintenance_windows_table, bulk_actions, create_rule_flow

[guskovaue]

Closes: #271278

Summary

Migrates 5 FTR test specs owned by @elastic/response-ops from x-pack/platform/test/functional_with_es_ssl to Scout Playwright tests under triggers_actions_ui/test/scout/ui/tests/.

All tests are tagged tags.stateful.classic (equivalent to the functional_with_es_ssl FTR suite).

Migrated specs

FTR source	Scout spec	Tests	Notes
triggers_actions_ui/alert_deletion.ts	alert_deletion.spec.ts	1	Inlines 3 stack-alert ES docs; expect.poll waits for event-log delete-alerts action instead of importing FTR-only alert_deletion_test_utils.ts (outside Scout tsconfig scope)
rules/rules_page/edit_rule_flow.ts	edit_rule_flow.spec.ts	6	test.noop → .es-query (API-created); each test navigates independently — no shared browser state like the FTR chain
triggers_actions_ui/maintenance_windows/maintenance_windows_table.ts	maintenance_windows_table.spec.ts	8	FTR page-objects (searchMaintenanceWindows, getMaintenanceWindowsList) inlined as helpers; createMw / deleteMw via kbnClient.request()
rules/rules_list/bulk_actions.ts	rules_bulk_actions.spec.ts	6	test.noop → .es-query; test.always-firing → .index-threshold (different type needed for the filter test); snooze/schedule via kbnClient.request()
rules/rules_page/create_rule_flow.ts	rules_create_flow.spec.ts	5	All 5 FTR tests including the previously de-scoped save/redirect tests; test.noop → .index-threshold with fillIndexThresholdForm helper

Key patterns introduced

• fillIndexThresholdForm(page, name) — fills the .index-threshold create form via UI: opens selectIndexExpression, types .kibana to trigger the async combobox, waits for [role="listbox"] (the "Choose…" fallback always renders the typed pattern), clicks the first option, waits for a date field in thresholdAlertTimeFieldSelect, selects it, closes the popover. Unblocks create-form save tests that previously required test.noop.

• saveRuleAndGetId(page) — clicks rulePageFooterSaveButton, handles the "no actions" confirmCreateRuleModal with a 3 s waitFor + .catch, waits for redirect to /app/rules/rule/, and extracts the new rule ID from the URL for cleanup.

• Event-log polling — expect.poll(() => esClient.search(...), {timeout: 30_000}) replaces FTR's retry.try for async ES verification.

• API cleanup — all created resources (rules, MWs) tracked in arrays and deleted in afterEach/afterAll via Promise.allSettled.

Scout environment substitutions

FTR	Scout
test.noop rule type	.es-query (API) / .index-threshold (UI)
test.always-firing rule type	.index-threshold
supertest snooze/schedule	kbnClient.request() to internal alerting API
FTR page objects for MWs	Inline helpers using direct page locators
alert_deletion_test_utils.ts import	Inlined simplified test data

Test plan

• Run node scripts/scout.js run-tests --config x-pack/platform/plugins/shared/triggers_actions_ui/test/scout/ui/playwright.config.ts against a local stateful/classic Kibana
• Verify all 5 new specs appear in the manifest (standard.json)
• Confirm no regressions in previously passing Scout specs

[infra-vault-gh-plugin-prod]

🤖 Jobs for this PR can be triggered through checkboxes. 🚧

ℹ️ To trigger the CI, please tick the checkbox below 👇

• Click to trigger kibana-pull-request for this PR!
• Click to trigger kibana-deploy-project-from-pr for this PR!
• Click to trigger kibana-deploy-cloud-from-pr for this PR!
• Click to trigger kibana-entity-store-performance-from-pr for this PR!
• Click to trigger kibana-storybooks-from-pr for this PR!