`slack-15.0`: upstream `txthrottler` (pre-)backports#479

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timvaillancourt wants to merge 1 commit intoslack-15.0from txthrottler-fix-pre-bps-slack-15.0

+166-146

Commits on Aug 7, 2024

txthrottler: move ThrottlerInterface to go/vt/throttler, use slices pkg, add stats (vitessio#16248 )
timvaillancourt
committed