- Replaced hardcoded schema names with constants (`TEST_SCHEMA`, `CONTROL_SCHEMA`) across multiple tests.
- Resolved IDE warnings by removing unused variables (`result`), suppressing `SqlResolve`, and using ASCII-compliant strings.
- Corrected typos in test data (`testdb` -> `test_db`, `Produktions` -> `Production`).
- Improved readability and maintainability in migration and tenant registry tests by introducing companion object constants.
- Improved schema isolation logic with constants for tenant schemas and search path management in PostgreSQL.
- Added `withTenant` utility in `TenantContextHolder` to simplify tenant context usage.
- Removed unused imports, variables, and helper functions (`random()` and redundant `NennungRepository` references).
- Included missing `multitenancy.*` configuration keys in `additional-spring-configuration-metadata.json` to address IDE warnings.
- Fixed schema isolation handling in Exposed by switching table creation to JDBC and explicitly setting `search_path` in PostgreSQL.
- Removed redundant `runBlocking` calls, unused variables, and IDE warnings in the test.
- Added `JwtDecoder` mock in `@TestConfiguration` to prevent application context loading errors.
- Verified that writes in one tenant schema are no longer visible in another.
chore(config): add `application-test.yaml` for better test environment setup
- Configured H2 as an in-memory database for tests.
- Disabled Flyway and Consul to avoid unnecessary dependencies during testing.
