test: fix mock configuration and lint errors in unit tests

- Fix logger mock missing default export in extractor.test.ts
- Fix performance-monitor mock configuration
- Fix prefer-const in validation-database.test.ts
- Fix no-unsafe-function-type in cleaner-handler.test.ts
- Fix no-empty-function in cleaner-application-service.test.ts
- Run prettier format on test files

All 622 tests now passing (59 files, 3 skipped)

tests/unit/services/validation/validation-database.test.ts

@@ -9,7 +9,7 @@ let lastPgOpts: any = null
 let pgConnectCalled = false
 
 let currentDbType: string = 'mysql'
-let currentDbConfig: any = {
+const currentDbConfig: any = {
   database: {
     mysql: { host: 'db', port: 3306, username: 'user', password: 'pass', database: 'erp' },
     sqlserver: {