test(backend): restore AP unit tests

[saschanaz]

What

ActivityPub unit testの復活

Why

Nest+Jestえの移行以来(b75184e)ずっと捨てられていたので

Additional info (optional)

#9970 のための準備です

[codecov]

Codecov Report

Merging #9987 (ea119b3) into develop (8c88365) will increase coverage by 1.30%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #9987      +/-   ##
===========================================
+ Coverage    23.14%   24.45%   +1.30%     
===========================================
  Files          699      699              
  Lines        64785    64785              
  Branches      1984     2240     +256     
===========================================
+ Hits         14995    15842     +847     
+ Misses       49790    48943     -847     

Impacted Files	Coverage Δ
...ges/backend/src/core/entities/NoteEntityService.ts	20.28% <0.00%> (+1.20%)	⬆️
...ackages/backend/src/models/entities/UserProfile.ts	100.00% <0.00%> (+2.04%)	⬆️
packages/backend/src/models/entities/Note.ts	100.00% <0.00%> (+2.05%)	⬆️
packages/backend/src/models/entities/User.ts	100.00% <0.00%> (+2.14%)	⬆️
...ges/backend/src/core/entities/UserEntityService.ts	33.39% <0.00%> (+2.53%)	⬆️
...end/src/core/entities/NotificationEntityService.ts	33.33% <0.00%> (+2.66%)	⬆️
packages/backend/src/core/AntennaService.ts	36.03% <0.00%> (+3.60%)	⬆️
packages/backend/src/logger.ts	69.81% <0.00%> (+3.77%)	⬆️
packages/backend/src/misc/prelude/array.ts	57.24% <0.00%> (+4.34%)	⬆️
packages/backend/src/core/HashtagService.ts	26.20% <0.00%> (+5.51%)	⬆️
... and 19 more

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[saschanaz]

ミスキー寄与以来初のcoverageアップ

[syuilo]

🙏🏻🙏🏻🙏🏻