[firebase-release] Removed change log and reset repo after 14.7.0 release

Author: google-oss-bot

CHANGELOG.md

@@ -1,9 +0,0 @@
-- Add emulator support to firebase storage MCP tools. (#8707)
-- Removed overeager error catch in `functions:list`.
-- Add validation during `firebase init` feature selection. (#5232)
-- Fixed an issue where the extensions emulator did not work with `demo-` projects. (#8720)
-- Fixed issue where `--export-on-exit` fails if the target directory does not exist. (#4688)
-- Fixed issue where the Firebase MCP server could not use application default credentials. (#8671)
-- Updated the Firebase Data Connect local toolkit to v2.7.0, which includes the following changes: (#8743)
-  - Fixed an issue where unwanted link dependencies are added to `package.json` when multiple package managers are used in a web project.
-  - Added linter warnings for naming convention violations & missing join table `@table(key)`.