fea(internal): remove repoCache global (#6098)

lib/config/presets/gitlab.spec.ts

lib/config/presets/local.spec.ts

lib/config/presets/npm.spec.ts

lib/datasource/crate/index.spec.ts

lib/datasource/dart/index.spec.ts

lib/datasource/docker/index.spec.ts

lib/datasource/galaxy/index.spec.ts

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

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

lib/datasource/go/index.spec.ts

lib/datasource/gradle-version/index.spec.ts

lib/datasource/helm/index.spec.ts

lib/datasource/hex/index.spec.ts

lib/datasource/index.ts

lib/datasource/maven/index.spec.ts

lib/datasource/npm/index.spec.ts

lib/datasource/nuget/index.spec.ts

lib/datasource/orb/index.spec.ts

lib/datasource/packagist/index.spec.ts

lib/datasource/packagist/index.ts