Fix limit by label key

[tanveergill]

Description of change

Checklist

• [ ] Tested in playground or other setup
• [ ] Screenshot (Grafana) from playground added to PR for 15+ minute run
• [ ] Documentation is changed or added
• [ ] Tests and/or benchmarks are included
• [ ] Breaking changes

Summary by CodeRabbit

• Refactor
  • Updated label key retrieval logic in quota scheduler to enhance performance and maintain compatibility with new rate limiter interface.
• Deprecations
  • Added deprecation warnings for fallback usage of the old GetLabelKey method in rate limiting scenarios.
• Documentation
  • Updated method signatures to reflect changes in label key retrieval process.

[coderabbitai[bot]]

Walkthrough

The codebase has been updated to replace the deprecated GetLabelKey method with the new GetLimitByLabelKey method in the RateLimiter interface. The quotaScheduler and rateLimiter types now use the new method for retrieving label keys. If the new method returns an empty string, a deprecation warning is logged, and the old method is used as a fallback.

Changes

File Path	Change Summary
.../quota-scheduler/quota-scheduler.go	Updated getLabelKey to use GetLimitByLabelKey with a fallback to deprecated GetLabelKey.
.../rate-limiter/rate-limiter.go	Replaced GetLabelKey with GetLimitByLabelKey in TakeIfAvailable method and lbProto.Parameters.

🐇✨ In the land of code, where the rabbits hop, We've changed our keys, from bottom to top. No more old ways, as we dance in the light, With GetLimitByLabelKey, our code takes flight! 🚀🌟

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