[firebase-release] Removed change log and reset repo after 9.10.1 release

Author: google-oss-bot

CHANGELOG.md

@@ -1,5 +0,0 @@
-- Include `appId` in web app configuration when using the Hosting emulator (#2798).
-- Add support for emulating the `demo-*` project ID namespace with fake Admin and Web SDK configurations (#3291).
-- Update Cloud Firestore emulator to v1.11.15 which fixes unexpected PERMISSION_DENIED errors when headers are empty (#3258)
-- Fix Auth emulator export only exporting 20 users. (#3311)
-- Update the workflow template generated by `firebase init hosting:github` so that the preview action doesn't attempt to run on PRs from forks (#3326)