fix(ui): workflow list sidebar filter correctly update URL query parameters for multi-value. Fixes #15213

[myzk-a]

Fixes #15213

Motivation

The Workflows list page does not correctly update URL query parameters when using multi-value filters (Phase, Labels):

1. Multiple selections not preserved: Selecting multiple phases (e.g., Running + Failed) only shows the last one in the URL
2. Unchecking not reflected: Unchecking a filter doesn't remove it from the URL

Modifications

This PR continues the work from #15217. Thanks to the original author for the investigation and implementation in that PR.

• Preserve repeated query parameters passed through historyUrl by appending extraSearchParams instead of replacing existing values with the same key.
• Keep single-value Workflows list query parameters (offset, limit, name filter, createdAfter, and finishedBefore) as single values when rebuilding the URL.
• Add tests for repeated extraSearchParams in historyUrl.
• Add Workflows list tests that verify:
  • selecting multiple phase and label filters adds repeated query parameters to the URL;
  • removing one selected phase and one selected label removes only the corresponding query parameters;
  • opening a URL with repeated phase and label query parameters restores the selected filters in the UI.

Verification

• Selecting multiple phases should be reflected in the URL.
• Deselecting a phase should be reflected in the URL.

test-multiple-phases.mp4

• Selecting multiple labels should be reflected in the URL.
• Deselecting a label should be reflected in the URL.

test-multiple-labels.mp4

Documentation

AI

I used Codex(v0.133.0) to help understand the related issue and pull request context, including #15213 and #15217, and to help prepare the test code for this change.