Enables switching between production and testing MySQL databases based on the `ENABLE_TEST_DB` environment variable and an `X-DB-ENV` request header.
Applies this dual database functionality primarily to bug report submission and administration features. New `TESTING_MYSQL_` environment variables are added for defining test database credentials.
Refines HTTP request logging by excluding health checks and admin session validation endpoints to reduce noise. Allows `/health` endpoints to bypass API and Admin key guards.
Temporarily disables HWID-based rate limiting for bug report submissions.
