test: add test cases for PresetWrapperComponent spec

[Ma77Ball]

What changes were proposed in this PR?

Replaces the placeholder/commented-out body of preset-wrapper.component.spec.ts with a real Vitest suite for PresetWrapperComponent, and re-enables the file in angular.json and tsconfig.spec.json (it was previously excluded from the build).

The new suite uses fake PresetService and NzMessageService providers and covers:

• ngOnInit guards: throws when field.key, templateOptions, or presetKey are missing; populates searchResults from getPresets.
• Functional API: applyPreset / deletePreset forward to PresetService with the configured preset key triple; getEntryTitle, getEntryDescription, and the show-all / prefix-match / empty-term / no-match branches of
  getSearchResults.
• Dropdown visibility: opening re-fetches presets, closing does not.
• Stream subscriptions: savePresetsStream updates searchResults only when type + target match; valueChanges only refreshes while the menu is open; ngOnDestroy tears down subscriptions.
• savePreset: builds the payload from sibling preset-wrapper fields (ignoring non-preset siblings) and routes valid presets to createPreset; invalid presets surface a toast error.

Any related issues, documentation, or discussions?

Closes: #4963

How was this PR tested?

npx ng test --watch=false --include='src/app/common/formly/preset-wrapper/preset-wrapper.component.spec.ts' --> 24 tests pass locally under the Vitest runner.

Was this PR authored or co-authored using generative AI tooling?

Was this PR authored or co-authored using generative AI tooling?

Co-Authored with Claude Opus 4.7 in compliance with ASF.

[chenlica]

@mengw15 Please review this PR.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.36%. Comparing base (bb78cca) to head (f87f295).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5009      +/-   ##
============================================
- Coverage     43.76%   43.36%   -0.40%     
- Complexity     1218     2183     +965     
============================================
  Files           768     1035     +267     
  Lines         31243    38818    +7575     
  Branches       3049     4061    +1012     
============================================
+ Hits          13673    16833    +3160     
- Misses        16865    20930    +4065     
- Partials        705     1055     +350     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.88% <ø> (ø)		Carriedforward from 6f9f0e3
agent-service	33.72% <ø> (ø)		Carriedforward from 6f9f0e3
amber	43.22% <ø> (-2.16%)	⬇️	Carriedforward from 6f9f0e3
computing-unit-managing-service	0.00% <ø> (ø)		Carriedforward from 6f9f0e3
config-service	0.00% <ø> (ø)		Carriedforward from 6f9f0e3
file-service	32.10% <ø> (ø)		Carriedforward from 6f9f0e3
frontend	35.17% <ø> (+0.37%)	⬆️
python	88.90% <ø> (ø)		Carriedforward from 6f9f0e3
workflow-compiling-service	47.72% <ø> (ø)		Carriedforward from 6f9f0e3

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[mengw15]

LGTM