[firebase-release] Removed change log and reset repo after 14.18.0 release

Author: google-oss-bot

CHANGELOG.md

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-- Fixed an issue with deploying indexes to Firestore Enterprise edition databases where explicit `__name__` fields could be incorrectly handled.
-- Graduated the MCP server from experiemental, and renamed the `experimental:mcp` command to `mcp`. The old name is now an alias.
-- Consolidated some MCP tools to reduce the total number presented to LLMs.
-- Renamed some MCP tools for clarity.
-- Renamed the `deploy` MCP prompt to `firebase_deploy` for consistency.
-- Added a `firebase_read_resources` MCP tool which can be used by LLMs to fetch guides or docs via `firebase://` links.
-- Added a new `/firebase:init` MCP prompt which can guide you through setting up backend services or Firebase AI logic for your app.
-- `firebase_update_environment` MCP tool supports accepting Gemini in Firebase Terms of Service.
-- Fixed a bug when `firebase init dataconnect` failed to create a React app when launched from VS Code extension (#9171).
-- Added seed_data.gql to Data Connect's initial movie template (#9232).
-- `firebase dataconnect:sql:migrate` now supports Cloud SQL instances with only private IPs. The command must be run in the same VPC of the instance to work. (##9200)
-- CloudSQL instances created with `firebase deploy` now default to Postgres 17.
-- Improved the clarity of the `firebase apptesting:execute` command when you have zero or multiple apps.
-- Fixed an issue where `firebase deploy --only firestore` would fail with 403 errors on projects that never had a database created.
-- Fixed an issue where deploying multiple Hosting sites with Functions could encounter a race condition (#9235).
-- Updated the Data Connect local dev toolkit to 2.14.0, which includes the following changes:
-  - Fixed a bug where @default(value) and @default(expr) is not validated on enum fields.
-  - JS/Kotlin codegen: Issue where if no response type was generated, generation would crash.
-  - Dart codegen: Fixed issue where if field name doesn't match name of enum, compilation breaks
-  - Dart codegen: Override `==` to allow for equality between data classes.