fix(deleted-project): Handle deleted Gitlab projects gracefully in project list and changelog

[M0nkeySan]

What

Previously, when trying to fetch projects that existed in our database but were
deleted from Gitlab, the project list and changelog modal commands would fail
entirely. This was because Promise.all would reject if any single project
fetch failed.

Fix

Changes:

• Added error handling around individual project fetches
• Filter out non-existing Gitlab projects instead of failing
• Ensures commands continue working even when some projects are inaccessible

Conclusion

This makes the system more resilient by allowing operations to continue even
when some referenced projects no longer exist in Gitlab.

[codecov]

Codecov Report

Attention: Patch coverage is 58.82353% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.26%. Comparing base (7f322f6) to head (36ec795).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/changelog/buildChangelogModalView.ts	12.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
- Coverage   78.38%   78.26%   -0.13%     
==========================================
  Files          94       94              
  Lines        1897     1909      +12     
  Branches      342      345       +3     
==========================================
+ Hits         1487     1494       +7     
+ Misses        401      387      -14     
- Partials        9       28      +19     

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