Add presubmit test for incorrect use of @Nullable annotations

1) For importing androidx / javax @Nullable
2) For using @NonNull

Bug: 455582307
Change-Id: I623a9f9334cc12c52230e6013b3540abf1718f4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7186783
Reviewed-by: Henrique Nakashima <[email protected]>
Auto-Submit: Andrew Grieve <[email protected]>
Commit-Queue: Henrique Nakashima <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1548680}
NOKEYCHECK=True
GitOrigin-RevId: a768343cb38b0bc642b5b475d90006ea10e50762
2 files changed