fix(dashboard): Show page size selector in table view

[gheine]

Summary

• Enable the page size selector dropdown in the rollouts table view by adding showSizeChanger: true to the Ant Design Table pagination config
• Users can now choose between 10, 20, 50, and 100 items per page

Test plan

• Open the Argo Rollouts dashboard in table view
• Verify the page size dropdown is visible in the pagination controls
• Change the page size and verify the table updates accordingly

🤖 Generated with Claude Code

[github-actions]

Published E2E Test Results

  4 files    4 suites   3h 38m 51s ⏱️
120 tests 110 ✅  7 💤 3 ❌
488 runs  452 ✅ 28 💤 8 ❌

For more details on these failures, see this check.

Results for commit ddb73b1.

♻️ This comment has been updated with latest results.

[github-actions]

Published Unit Test Results

2 443 tests   2 443 ✅  3m 18s ⏱️
  129 suites      0 💤
    1 files        0 ❌

Results for commit ddb73b1.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.84%. Comparing base (e046515) to head (ddb73b1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4629      +/-   ##
==========================================
- Coverage   84.86%   84.84%   -0.03%     
==========================================
  Files         164      164              
  Lines       18954    18954              
==========================================
- Hits        16086    16082       -4     
- Misses       2007     2009       +2     
- Partials      861      863       +2     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud