[firebase-release] Removed change log and reset repo after 14.19.0 release

Author: google-oss-bot

CHANGELOG.md

@@ -1,5 +0,0 @@
-- Deprecated Java versions below 21. Support will be dropped in Firebase CLI v15. Please upgrade to Java version 21 or above to continue using the emulators.
-- Fix Functions MCP log tool to normalize sort order and surface Cloud Logging error details (#9247)
-- Fixed an issue where `firebase init` would require log in even when no project is selected. (#9251)
-- Added `remoteconfig:experiments:get`, `remoteconfig:experiments:list`, and `remoteconfig:experiments:delete` commands to manage Remote Config experiments.
-- Added `remoteconfig:rollouts:get`, `remoteconfig:rollouts:list`, and `remoteconfig:rollouts:delete` commands to manage Remote Config rollouts.