[firebase-release] Removed change log and reset repo after 14.26.0 release

Author: google-oss-bot

CHANGELOG.md

@@ -1,4 +0,0 @@
-- Add support for nodejs24 (beta) runtime for Cloud Functions for Firebase. (#9475)
-- Adds listServices and also defines trigger within runv2.ts (#9482)
-- Updates the `firebase init functions` template to use [`firebase-functions` 7.0.0](https://firebase.google.com/support/releases#cloudfunctions-700-launch) (#9496)
-- Updated to v2.17.2 of the Data Connect emulator, which fixes a bug with handling of optional enum lists in generated Flutter SDKs. (#9391)