Backport of proto: clear out old ratelimit.tmp files before making new ones into release/1.15.x #17307
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Backport
This PR is auto-generated from #17292 to be assessed for backporting due to the inclusion of the label backport/1.15.
The below text is copied from the body of the original PR.
Description
This will ensure that we don't use stale
.ratelimit.tmp
files from prior runs or branches.Overview of commits