Fix flaky specs due to rate limiter change
What does this MR do and why?
This fixes flaky specs due to the change I made to the rate limiter: !73343 (merged)
We're now counting requests in the rate limiter based on fixed 1-minute buckets instead of 1-minute from the first request. So if the test is run near the end of the minute (e.g. ::59), the next requests would fall into the next bucket which means it won't go over the rate limit.
MR acceptance checklist
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Related to #345422 (closed)
Edited by Heinrich Lee Yu