refactor(github): Convert datasources to class form (#14124)

lib/constants/platform.spec.ts

lib/datasource/api.ts

lib/datasource/github-releases/common.spec.ts

lib/datasource/github-releases/common.ts

lib/datasource/github-releases/digest.spec.ts

lib/datasource/github-releases/index.spec.ts

lib/datasource/github-releases/index.ts

lib/datasource/github-tags/index.spec.ts

lib/datasource/github-tags/index.ts

lib/datasource/go/__snapshots__/index.spec.ts.snap

lib/datasource/go/base.spec.ts

lib/datasource/go/base.ts

lib/datasource/go/common.ts

lib/datasource/go/index.spec.ts

lib/datasource/go/index.ts

lib/datasource/go/releases-direct.ts

lib/manager/ansible-galaxy/collections.ts

lib/manager/ansible-galaxy/index.ts

lib/manager/batect-wrapper/extract.spec.ts

lib/manager/batect-wrapper/extract.ts