refactor: replace enums with union/object (#18903)

lib/modules/platform/azure/index.spec.ts

lib/modules/platform/azure/index.ts

lib/modules/platform/azure/types.ts

lib/modules/platform/azure/util.ts

lib/modules/platform/bitbucket-server/index.spec.ts

lib/modules/platform/bitbucket-server/index.ts

lib/modules/platform/bitbucket-server/utils.ts

lib/modules/platform/bitbucket/index.spec.ts

lib/modules/platform/bitbucket/index.ts

lib/modules/platform/bitbucket/utils.ts

lib/modules/platform/codecommit/index.spec.ts

lib/modules/platform/codecommit/index.ts

lib/modules/platform/gitea/gitea-helper.spec.ts

lib/modules/platform/gitea/gitea-helper.ts

lib/modules/platform/gitea/index.spec.ts

lib/modules/platform/gitea/index.ts

lib/modules/platform/gitea/types.ts

lib/modules/platform/github/common.ts

lib/modules/platform/github/index.spec.ts

lib/modules/platform/github/index.ts