[firebase-release] Removed change log and reset repo after 14.27.0 release

Author: google-oss-bot

CHANGELOG.md

@@ -1,6 +0,0 @@
-- Fixed issue where MCP server didn't detect if iOS app uses Crashlytics in projects that use `project.pbxproj` (#9515)
-- Add logic to synchronize v2 scheduled function timeout with Cloud Schduler's attempt deadline (#9544)
-- Prevent deployments of Next.js apps vulnerable to CVE-2025-66478 (#9572)
-- Updated Data Connect emulator to v2.17.3:
-  - Fixed Swift codegen: Include FirebaseCore import in the connector keys file.
-  - Fixed a bug where debug details of Internal errors were swallowed: https://github.com/firebase/firebase-tools/issues/9508