chore: added eslint-plugin-playwright

[artembelik]

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[Copilot]

Pull request overview

This PR introduces eslint-plugin-playwright to enforce Playwright testing best practices across the repo’s E2E test suite, and updates existing Playwright specs to comply with the newly enabled rules.

Changes:

• Add eslint-plugin-playwright dependency (and lockfile entries).
• Configure ESLint to apply plugin:playwright/recommended rules to Playwright spec files.
• Update Playwright tests to satisfy Playwright ESLint recommendations (e.g., prefer locator() usage and toBeHidden()), plus add targeted rule disables for intentional waitForTimeout() usage.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Adds eslint-plugin-playwright to devDependencies.
yarn.lock	Locks eslint-plugin-playwright and its dependency (globals).
.eslintrc.js	Adds a Playwright-specific ESLint override extending plugin:playwright/recommended.
.eslintignore	Ignores .angular and playwright-report directories.
dev/ag-grid-angular/src/tests/theme.playwright-spec.ts	Updates interactions to use page.locator(...).hover()/click() patterns.
dev/ag-grid-angular/src/tests/quick-filter-state.playwright-spec.ts	Replaces not.toBeVisible() with toBeHidden() for hidden-state checks.
dev/ag-grid-angular/src/tests/loading-overlay.playwright-spec.ts	Replaces not.toBeVisible() with toBeHidden() for hidden-state checks.
dev/ag-grid-angular/src/tests/infinite-selection.playwright-spec.ts	Adds a targeted disable for playwright/no-wait-for-timeout.
dev/ag-grid-angular/src/tests/external-filter-state.playwright-spec.ts	Replaces not.toBeVisible() with toBeHidden() for hidden-state checks.
dev/ag-grid-angular/src/tests/column-state.playwright-spec.ts	Uses expect(bounds).not.toBeNull() and non-null assertions for bounding box usage; replaces a visibility negation with toBeHidden().
dev/ag-grid-angular/src/tests/column-menu.playwright-spec.ts	Adds targeted disables for waitForTimeout and replaces not.toBeVisible() with toBeHidden() for hidden-state checks.