feat(endorsement-system): Test suite overhaul

[rafnarnason]

...

Attach a link to issue if relevant

What

Specify what you're trying to achieve

Why

Specify why you need to achieve this

Screenshots / Gifs

Attach Screenshots / Gifs to help reviewers understand the scope of the pull request

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Formatting passes locally with my changes
• I have rebased against main before asking for a review

[datadog-island-is]

Datadog Report

All test runs 9fbfad3 🔗

✅ 4 Total Test Services: 0 Failed, 4 Passed
🔻 Test Sessions change in coverage: 1 decreased (-20.39%), 5 no change

Test Services

Service Name	Failed	Known Flaky	New Flaky	Passed	Skipped	Total Time	Code Coverage Change	Test Service View
api	0	0	0	4	0	3.2s	1 no change	Link
application-system-api	0	0	0	120	2	3m 15.32s	1 no change	Link
application-template-api-modules	0	0	0	123	0	2m 27.83s	1 no change	Link
services-endorsements-api	0	0	0	5	0	21.62s	1 decreased (-20.39%)	Link

🔻 Code Coverage Decreases vs Default Branch (1)

• services-endorsements-api - jest 31.3% (-20.39%) - Details

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.62%. Comparing base (d6b0e01) to head (2023e2a).
Report is 50 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16468      +/-   ##
==========================================
- Coverage   36.78%   36.62%   -0.17%     
==========================================
  Files        6835     6831       -4     
  Lines      141418   141546     +128     
  Branches    40266    40373     +107     
==========================================
- Hits        52019    51836     -183     
- Misses      89399    89710     +311     

Flag	Coverage Δ
api	3.37% <ø> (ø)
application-system-api	41.35% <ø> (-0.03%)	⬇️
application-template-api-modules	27.80% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 59 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d6b0e01...2023e2a. Read the comment docs.