* feat: remove old assist split test
* feat: moving featue rate limiters to main shared directory for use in multiple modules
* feat: base workbench rate limiter on a token specific base class
* feat: rename aiErrorAssistRateLimiter to AiFeatureUsageRateLimiter to better reflect its for our shared ai usage quota
GitOrigin-RevId: 89464d115b5904f6274756a7169e2b35945e2fc9