chore(frontend): remove the unused UserWorkflowListItemComponent

[aglinxinyuan]

What changes were proposed in this PR?

Deletes UserWorkflowListItemComponent, which is declared in AppModule but whose selector texera-user-workflow-list-item appears in no template — so it is never rendered. HighlightSearchTermsPipe goes with it, because the component's own template is the pipe's last remaining consumer. Pure deletion, no behaviour change: −1,104 lines.

History

Introduced by	#1937 (2023-05-30) — "Refactored each workflow list item into its own component"
Usage removed by	#2793 (2024-08-20) — "Generalize List Item" replaced it with the generic ListItemComponent, deleting the last two texera-user-workflow-list-item uses from search-results.component.html

Dead for about two years.

Reviewer note — why the pipe is in the same PR. HighlightSearchTermsPipe arrived in #2386 and kept a second consumer until #7463 (2026-08-29, "remove the deprecated project feature") dropped entry.name | highlightSearchTerms from that template. Since then its only use is this dead component's template (L43/L106). Removing the component alone would leave the pipe dead in the same commit, so they ship together; splitting them would just create a second PR for code this one already orphans.

Nothing else needs cleaning: WorkflowExecutionHistoryComponent, ShareAccessComponent, DownloadService, GuiConfigService and WorkflowPersistService all keep other consumers.

Any related issues, documentation, discussions?

Closes #8460

How was this PR tested?

Existing tests only — this PR removes a component, a pipe, and the two specs that covered them.

From frontend/:

• npx ng build — success. This is the gate that matters here: removing an AppModule declaration can only be proven safe by an AOT build, since template diagnostics are AOT-only. A leftover use of either selector would fail it.
• npx ng test --watch=false --include='**/user-workflow.component.spec.ts' — 75 tests pass after dropping the two inert TestBed references.
• yarn --cwd frontend format:ci — clean.

Verification, re-runnable by a reviewer:

git grep -n "texera-user-workflow-list-item\|UserWorkflowListItemComponent"
git grep -n "highlightSearchTerms\|HighlightSearchTermsPipe"

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Automated Reviewer Suggestions

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

• Contributors with relevant context: @tanishqgandhi1908
  You can notify them by mentioning @tanishqgandhi1908 in a comment.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.92%. Comparing base (bda3400) to head (ab35bc6).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8463      +/-   ##
============================================
- Coverage     93.94%   93.92%   -0.03%     
  Complexity     4826     4826              
============================================
  Files          1209     1206       -3     
  Lines         49705    49584     -121     
  Branches       6074     6063      -11     
============================================
- Hits          46694    46570     -124     
- Misses         1522     1524       +2     
- Partials       1489     1490       +1     

Flag	Coverage Δ		*Carryforward flag
access-control-service	80.18% <ø> (ø)		Carriedforward from bda3400
agent-service	99.32% <ø> (ø)		Carriedforward from bda3400
amber	89.91% <ø> (ø)		Carriedforward from bda3400
computing-unit-managing-service	75.05% <ø> (ø)		Carriedforward from bda3400
config-service	87.12% <ø> (ø)		Carriedforward from bda3400
file-service	83.65% <ø> (ø)		Carriedforward from bda3400
frontend	96.74% <ø> (-0.04%)	⬇️
notebook-migration-service	83.73% <ø> (ø)		Carriedforward from bda3400
pyamber	98.47% <ø> (ø)		Carriedforward from bda3400
workflow-compiling-service	77.19% <ø> (ø)		Carriedforward from bda3400

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

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