fix(mypy): fix mypy errors for src/sentry/api/serializers/models (part 1)

[hubertsentry]

Fix mypy errors under src/sentry/api/serializers/models

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

[codecov]

Codecov Report

Merging #53905 (ff578f5) into master (903f7b4) will decrease coverage by 0.02%.
Report is 11 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #53905      +/-   ##
==========================================
- Coverage   79.61%   79.60%   -0.02%     
==========================================
  Files        4984     4983       -1     
  Lines      210736   210531     -205     
  Branches    35877    35846      -31     
==========================================
- Hits       167779   167590     -189     
+ Misses      37809    37798      -11     
+ Partials     5148     5143       -5     

Files Changed	Coverage Δ
...pp/components/events/eventReplay/replayPreview.tsx	100.00% <ø> (ø)
...nents/replays/breadcrumbs/replayTimelineEvents.tsx	0.00% <ø> (ø)
static/app/components/replays/replayContext.tsx	45.37% <ø> (ø)
static/app/components/replays/utils.tsx	90.00% <ø> (-0.70%)	⬇️
...atic/app/components/replays/walker/splitCrumbs.tsx	100.00% <ø> (ø)
...tatic/app/utils/replays/hooks/useCrumbHandlers.tsx	87.50% <ø> (+50.65%)	⬆️
static/app/utils/replays/replayDataUtils.tsx	100.00% <ø> (+12.90%)	⬆️
static/app/utils/replays/replayReader.tsx	60.00% <ø> (-15.00%)	⬇️
...entry/api/serializers/models/alert_rule_trigger.py	100.00% <100.00%> (ø)
src/sentry/api/serializers/models/commit.py	93.22% <100.00%> (ø)
... and 5 more

... and 14 files with indirect coverage changes

[asottile-sentry]

nice!

[asottile-sentry]

[asottile-sentry]

[hubertsentry]

Sorry, it took longer then I thought. It seems like one of my change caused openapi-diff issue. My change is probably doing the right thing, however, it will make api schema incompatible. Let me revert the change for that file now, I will see how I can address the issue later.