test: add real test cases for PresetService spec

[Ma77Ball]

What changes were proposed in this PR?

Replaces the old all-commented-out preset.service.spec.ts with a real, runnable Vitest test suite for PresetService, and re-enables the file in angular.json and tsconfig.spec.json (it was previously excluded from the build).

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

• Preset I/O: applyPresetStream / savePresetsStream event emission; savePresets routing non-empty lists to userConfig.set and empty lists to userConfig.delete; default vs. suppressed save toast; createPreset / updatePreset /
  deletePreset / getPresets happy paths and error cases.
• Operator preset application: applyPreset is a no-op for non-operator types and unknown operator IDs; valid presets merge into operator properties; invalid presets leave properties unchanged.
• Validation: isValidOperatorPreset and isValidNewOperatorPreset accept/reject the expected shapes.
• Static helpers: getOperatorPresetSchema, getOperatorPreset, and filterOperatorPresetProperties.

Also registers the project's custom "enable-presets" Ajv keyword as a no-op in the test file so Ajv 8 strict mode doesn't reject the operator schemas at compile time.

Any related issues, documentation, or discussions?

Closes: #4968

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

Co-Authored with Claude Opus 4.7 in compliance with ASF

[Ma77Ball]

/request-review @aglinxinyuan

[Copilot]

Pull request overview

This PR replaces the previously commented-out PresetService spec with a runnable Vitest suite and re-enables that spec file in the Angular/Vitest test configuration so it executes in CI.

Changes:

• Replaced preset.service.spec.ts placeholder with real unit tests using stubbed UserConfigService and NzMessageService.
• Re-enabled preset.service.spec.ts by removing it from the test exclusion lists in tsconfig.spec.json and angular.json.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
frontend/src/tsconfig.spec.json	Removes preset.service.spec.ts from the excluded specs so it’s compiled/executed.
frontend/angular.json	Removes preset.service.spec.ts from the unit-test builder’s exclude list so Vitest runs it.
frontend/src/app/workspace/service/preset/preset.service.spec.ts	Adds a full Vitest test suite for PresetService, including preset I/O, operator application, validation, and static helpers.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.95%. Comparing base (6f088ab) to head (18e2076).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4991      +/-   ##
============================================
+ Coverage     42.73%   42.95%   +0.21%     
  Complexity     2187     2187              
============================================
  Files          1031     1031              
  Lines         38152    38153       +1     
  Branches       4004     4004              
============================================
+ Hits          16305    16389      +84     
+ Misses        20831    20742      -89     
- Partials       1016     1022       +6     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)		Carriedforward from 6f088ab
agent-service	33.72% <ø> (ø)		Carriedforward from 6f088ab
amber	43.23% <ø> (ø)		Carriedforward from 6f088ab
computing-unit-managing-service	0.00% <ø> (ø)		Carriedforward from 6f088ab
config-service	0.00% <ø> (ø)		Carriedforward from 6f088ab
file-service	32.18% <ø> (ø)		Carriedforward from 6f088ab
frontend	33.67% <ø> (+0.59%)	⬆️
python	88.90% <ø> (ø)		Carriedforward from 6f088ab
workflow-compiling-service	47.72% <ø> (ø)		Carriedforward from 6f088ab

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

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