refactor: global cache (#6198)

lib/config/presets/github/index.spec.ts

lib/config/presets/gitlab/index.spec.ts

lib/config/presets/local/index.spec.ts

lib/config/presets/npm/index.spec.ts

lib/datasource/cache.ts

lib/datasource/cdnjs/index.spec.ts

lib/datasource/crate/index.ts

lib/datasource/docker/index.spec.ts

lib/datasource/docker/index.ts

lib/datasource/galaxy/index.ts

lib/datasource/git-refs/index.spec.ts

lib/datasource/git-refs/index.ts

lib/datasource/git-submodules/index.spec.ts

lib/datasource/git-submodules/index.ts

lib/datasource/git-tags/index.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/gitlab-tags/index.spec.ts