add E2E tests for DAG Runs tab

[Sahil-Shadwal]

Add E2E tests for DAG Runs tab functionality.

Changes

• Added data-testid to DagRuns.tsx for E2E testing
• Extended DagsPage.ts with 7 methods for Runs tab interactions
• Created test suite with 4 test cases covering navigation, display, filtering, search, and pagination

Test Coverage

✅ Navigate to Runs tab
✅ Verify run details (ID, state, times, duration)
✅ Click run to view details
✅ Filter and search functionality
✅ Pagination

Closes #59541

Related issues: #59028

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[boring-cyborg]

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[vatsrahul1001]

Thanks for the PR @Sahil-Shadwal I will review soon