[firebase-release] Removed change log and reset repo after 14.11.0 release

Author: google-oss-bot

CHANGELOG.md

@@ -1,4 +0,0 @@
-- Add experimental App Testing feature
-- Fixed an issue where the Cloud Task emulator couldn't decode non-ASCII characters. (#8836)
-- Fixed an issue where `firestore:indexes` wrongly removed the `__name__` field. (#7629)
-- Update Firebase Data Connect Emulator to version 2.10.0, which added support for full-text search, user-defined enums, and moved SQL/CEL errors to the GraphQL debug_details field. (#8837)