[firebase-release] Removed change log and reset repo after 12.4.5 rel…

…ease

CHANGELOG.md

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-- Fixed bug where `functions:secrets:set` didn't remove stale versions of a secret. (#6080)
-- Fixed bug where `firebase deploy --only firestore:named-db` didn't update rules. (#6129)
-- Fixed issue where Flutter Web is not detected as a web framework. (#6085)
-- Added better messages for API permissions failures that direct the user to the URL to enable the API. (#6130)
-- Fixed issue caused by adding type checks in #5906.
-- Fixed `next/image` component in app directory for Next.js > 13.4.9. (#6143)
-- Fixed bug where Next.js Image Optimization in the app directory was not requiring a Cloud Function. (#6143)
-- Fixed a transitive dependency on a vulnerable version of `vm2`. (#6150)