
Automatic merge from submit-queue (batch tested with PRs 50103, 49677, 49449, 43586, 48969) Run kazel on the entire tree **What this PR does / why we need it**: part of #47558: auto-generate `BUILD` files on the entire tree, since this is what `gazelle` does, and it'll make subsequent reviews easier if less is changing. **Release note**: ```release-note NONE ``` /assign /release-note-none