fix: check relationships before deprecating objects

[seansica]

Why

Deprecation saved the object and its relationship changes at the same time. That could retire the object before its relationships were ready, and embedded references were not checked.

What changes

• Check for embedded references first. If any remain, explain what the user must remove and make no changes.
• Otherwise, retire ordinary relationships first, then deprecate the object.
• Keep existing subtechnique-of and revoked-by links.
• Do not automatically deprecate a data source’s components. Their references must be resolved explicitly.

Checks

Verified in the browser: ordinary relationships retire first, special links remain unchanged, and embedded blockers prevent writes.

Companion API change: mitre-attack/attack-workbench-rest-api#514

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 69.96700% with 91 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.33%. Comparing base (fc89c77) to head (7a4aac2).

Files with missing lines	Patch %	Lines
...omponents/object-status/object-status.component.ts	27.11%	43 Missing ⚠️
...pp/views/stix/stix-dialog/stix-dialog.component.ts	37.03%	17 Missing ⚠️
src/app/services/helpers/deprecation.service.ts	91.42%	14 Missing and 1 partial ⚠️
...hboard-page/data-quality/data-quality.component.ts	65.78%	13 Missing ⚠️
.../connectors/rest-api/rest-api-connector.service.ts	25.00%	3 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             next     #972      +/-   ##
==========================================
+ Coverage   48.94%   49.33%   +0.38%     
==========================================
  Files         213      214       +1     
  Lines       29070    29203     +133     
  Branches     2291     2351      +60     
==========================================
+ Hits        14228    14406     +178     
+ Misses      14754    14708      -46     
- Partials       88       89       +1     

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[github-actions]

🎉 This PR is included in version 4.16.1 🎉

The release is available on:

• GitHub release
• v4.16.1

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