feat: apitoken last characters option

[mdtro]

• Add an option to toggle on/off automatically populating the token_last_characters for the ApiToken model.

This option will ensure tokens created from here on have the field populated. It will also allow me to thoroughly test the backfill migration needed for existing tokens that will be coming in a future PR by disabling the option in tests, creating a bunch of API tokens, and then running the backfill migration test.

Tracking Issue: #58918
RFC: getsentry/rfcs#32

[codecov]

Codecov Report

Merging #59455 (6120b76) into master (398c381) will decrease coverage by 0.01%.
Report is 849 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #59455      +/-   ##
==========================================
- Coverage   80.76%   80.76%   -0.01%     
==========================================
  Files        5179     5179              
  Lines      227404   227418      +14     
  Branches    38254    38255       +1     
==========================================
+ Hits       183671   183679       +8     
- Misses      38138    38144       +6     
  Partials     5595     5595              

Files	Coverage Δ
src/sentry/backup/comparators.py	94.35% <ø> (ø)
src/sentry/models/apitoken.py	99.02% <100.00%> (+0.06%)	⬆️
src/sentry/options/defaults.py	100.00% <100.00%> (ø)
static/app/components/avatar/avatarList.tsx	90.90% <ø> (ø)
...atic/app/utils/analytics/growthAnalyticsEvents.tsx	100.00% <ø> (ø)

... and 7 files with indirect coverage changes

[azaslavsky]

If we want to be extra careful, we should modify one of the two calls to ApiToken.objects.create(...) in src/sentry/testutils/helpers/backups.py to include token_last_characters, while the other one continues writing null. Then we get coverage for both options while we roll this out, to prevent breaking self-hosted users.

[getsantry]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you remove the label Waiting for: Community, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀