refactor: customRegistrySupport (#9142)

lib/datasource/bitbucket-tags/index.ts

lib/datasource/cdnjs/index.ts

lib/datasource/clojure/index.ts

lib/datasource/crate/index.ts

lib/datasource/dart/index.ts

lib/datasource/docker/index.ts

lib/datasource/galaxy/index.ts

lib/datasource/git-refs/index.ts

lib/datasource/git-tags/index.ts

lib/datasource/github-releases/index.ts

lib/datasource/github-tags/index.ts

lib/datasource/gitlab-tags/index.ts

lib/datasource/go/index.ts

lib/datasource/gradle-version/index.ts

lib/datasource/helm/index.ts

lib/datasource/hex/index.ts

lib/datasource/index.ts

lib/datasource/jenkins-plugins/index.ts

lib/datasource/maven/index.ts

lib/datasource/npm/index.ts