feat(internal): datasource defaultRegistryUrls / appendRegistry… (#5686)

lib/datasource/clojure/index.ts

lib/datasource/common.ts

lib/datasource/index.ts

lib/datasource/maven/common.ts

lib/datasource/maven/index.ts

lib/datasource/maven/util.ts

lib/datasource/pod/index.ts

lib/datasource/rubygems/index.ts

lib/datasource/rubygems/releases.ts

lib/datasource/sbt-package/index.spec.ts

lib/datasource/sbt-package/index.ts

lib/datasource/sbt-plugin/index.ts

lib/manager/deps-edn/__snapshots__/extract.spec.ts.snap

lib/manager/deps-edn/extract.ts

lib/manager/leiningen/__snapshots__/extract.spec.ts.snap

lib/manager/leiningen/extract.spec.ts

lib/manager/leiningen/extract.ts