[firebase-release] Removed change log and reset repo after 9.12.0 rel…

…ease

CHANGELOG.md

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-- Enable running functions in multiple regions in the emulator. (#3364)
-- Adds the deployed version to the output when deploying to Firebase Hosting. (#3157)
-- Updates the configured runtime for functions generated by `firebase init functions` from Node.js 12 to 14 (#3399)
-- Releases Firestore Emulator v1.12.0: supports clearing data partially. (#3402)
-- Fixes manually setting download tokens in Storage Emulator. (#3396)
-- Fixes deleting custom metadata in Storage emulator. (#3385)
-- Fixes errors when calling makePublic() with Storage Emulator(#3394)
-- Fixes mishandling of bytes when uploading two files with the same name in the Storage Emulator (#3406)
-- Adds support for setting user labels on scheduled functions. (#3408)