UI E2E Test || DAG-011: Verify backfills list displays

[vatsrahul1001]

Description

Add E2E tests to verify the Backfills tab functionality on the DAG detail page (/dags/:dagId).

What to test

• Navigate to a DAG's Backfills tab
• Verify backfills list displays (or empty state if none)
• Verify backfill details display: date range, status, created time
• Verify Table filters

Related issues

#59028

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[iharsh02]

Can I work on this issue

[Jayesh45-master]

@vatsrahul1001
Hello Sir,
If this issue is ready can you assign to me plss ?

[iharsh02]

I am working on this issue