[aglinxinyuan]

What changes were proposed in this PR?

Removes dead members and unused service injections from WorkflowExecutionHistoryComponent and its test suite:

1. workflow-execution-history.component.ts:
   • Drops unused WorkflowActionService constructor injection and import.
   • Drops currentlyHoveredExecution field which is never set (its hover handlers were dropped previously).
2. workflow-execution-history.component.html:
   • Simplifies the bookmark star icon's [nzTheme] condition to row.bookmarked ? 'fill' : 'outline'.
3. workflow-execution-history.component.spec.ts:
   • Drops OperatorMetadataService and StubOperatorMetadataService imports and provider, which were only needed to instantiate the unused WorkflowActionService.

+1/-9 lines. Pure cleanup with no behavior change.

Any related issues, documentation, discussions?

Closes #9193.

How was this PR tested?

• Prettier check passed:
  npx prettier --check src/app/dashboard/component/user/user-workflow/ngbd-modal-workflow-executions/workflow-execution-history.component.ts src/app/dashboard/component/user/user-workflow/ngbd-modal-workflow-executions/workflow-execution-history.component.html src/app/dashboard/component/user/user-workflow/ngbd-modal-workflow-executions/workflow-execution-history.component.spec.ts
• TypeScript compilation check (src/tsconfig.spec.json): zero errors in modified files.
• Verified 0 callers repo-wide for currentlyHoveredExecution.

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[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @Neilk1021, @mengw15, @Yicong-Huang
  You can notify them by mentioning @Neilk1021, @mengw15, @Yicong-Huang in a comment.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.98%. Comparing base (1aa7e2a) to head (b272bc7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #9194      +/-   ##
============================================
- Coverage     91.98%   91.98%   -0.01%     
  Complexity     5084     5084              
============================================
  Files          1281     1281              
  Lines         55812    55810       -2     
  Branches       7076     7076              
============================================
- Hits          51339    51336       -3     
  Misses         2733     2733              
- Partials       1740     1741       +1     

Flag	Coverage Δ		*Carryforward flag
access-control-service	77.44% <ø> (ø)		Carriedforward from 1aa7e2a
agent-service	99.16% <ø> (ø)		Carriedforward from 1aa7e2a
amber	86.42% <ø> (ø)		Carriedforward from 1aa7e2a
computing-unit-managing-service	63.52% <ø> (ø)		Carriedforward from 1aa7e2a
config-service	87.50% <ø> (ø)		Carriedforward from 1aa7e2a
file-service	82.29% <ø> (ø)		Carriedforward from 1aa7e2a
frontend	96.53% <100.00%> (-0.01%)	⬇️
notebook-migration-service	83.77% <ø> (ø)		Carriedforward from 1aa7e2a
pyamber	98.54% <ø> (ø)		Carriedforward from 1aa7e2a
workflow-compiling-service	74.25% <ø> (ø)		Carriedforward from 1aa7e2a

*This pull request uses carry forward flags. Click here to find out more.

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[kunwp1]

LGTM!