feat: Add multi-select checkboxes to Dag Runs UI (#63854)

[bhumikasudarshani-cmd]

Description

This PR introduces the functionality of bulk actions with multiple selections in the Dag Runs UI, thus filling the gap between Airflow 2 and 3.

Changes

• Introduced checkboxes on all rows of the Dag Runs table
• Introduced the ability to check all rows via the checkbox on the header row
• Introduced floating ActionBar, appearing when rows are checked
• Introduced buttons: Clear, Mark Success, Mark Failed
• Preserved buttons on individual rows

Screenshots

Related Issues

Closes #63854

Tests

• backend
• frontend

[boring-cyborg]

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