Part of Phase 3.2 (task 1): Remove dead searchUrl prop in the TracePage

[Parship12]

Which problem is this PR solving?

• Resolves part of [🧑‍🎓 LFX]: Upgrading Core Routing and State Management #3313
• Resolves part of [UI Refactor] Migrate TracePage to Functional Component #3381

Description of the changes

• Remove the dead searchUrl prop as no code path reads this.props.searchUrl. The header still getting its "back to search (←)" URL via toSearch, which comes from the component's location prop.

How was this change tested?

• Unit tests passing
• Tested the "back to search" link
  • click on any trace
  • On the trace page, look at the top left of the header: click this ← button, you should be taken back to the search results page
• Tested the span search filter

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/main/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully: make lint test

AI Usage in this PR (choose one)

See AI Usage Policy.

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.15%. Comparing base (dc6be4d) to head (f8949bb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3603      +/-   ##
==========================================
- Coverage   89.15%   89.15%   -0.01%     
==========================================
  Files         304      304              
  Lines        9727     9725       -2     
  Branches     2595     2593       -2     
==========================================
- Hits         8672     8670       -2     
+ Misses       1052     1051       -1     
- Partials        3        4       +1     

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[Copilot]

Pull request overview

Removes the unused searchUrl prop from TracePage Redux props/state mapping, simplifying the component’s props surface as part of the ongoing Jaeger UI routing/state modernization.

Changes:

• Drop searchUrl from TReduxProps and from mapStateToProps() in TracePage.
• Remove the now-obsolete unit test that asserted fromSearch propagation via mapStateToProps(), and update expected props accordingly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/jaeger-ui/src/components/TracePage/index.tsx	Removes searchUrl from Redux-derived props and stops reading it from state.router.location.state.
packages/jaeger-ui/src/components/TracePage/index.test.js	Updates mapStateToProps() expectations and removes the test for fromSearch → searchUrl propagation.

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[Parship12]

@yurishkuro ptal