Migrate MM-53377 regression test from Cypress to Playwright (#29460)

* feat: Migrate MM-53377 regression test from Cypress to Playwright

* fix: Update mm_53377 regression test to use admin client for setup

* fix: Correct admin client usage in mm_53377 regression test

* refactor: Standardize mm_53377 Playwright test with consistent naming and imports

* fix: Mark MM-T53377 test as fixme for investigation

* Migrating mm_53377_regression_test_spec.js cypress test to playwright

* Fixing linter errors

* Addressing PR review comment

* Fixing broken test

webapp/channels/src/components/suggestion/suggestion_list.tsx

@@ -298,6 +298,7 @@ export default class SuggestionList extends React.PureComponent<Props> {
             >
                 <div
                     id='suggestionList'
+                    data-testid='suggestionList'
                     role='list'
                     ref={this.contentRef}
                     style={{