refactor: Identify tests relying on single snapshots (#11150)

lib/config/massage.spec.ts

lib/config/migrate-validate.spec.ts

lib/config/migration.spec.ts

lib/config/presets/bitbucket-server/index.spec.ts

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

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

lib/config/presets/index.spec.ts

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

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

lib/datasource/index.spec.ts

lib/datasource/metadata.spec.ts

lib/logger/config-serializer.spec.ts

lib/logger/err-serializer.spec.ts

lib/logger/index.spec.ts

lib/logger/pretty-stdout.spec.ts

lib/manager/azure-pipelines/extract.spec.ts

lib/manager/bazel/extract.spec.ts

lib/manager/bundler/artifacts.spec.ts

lib/manager/bundler/gemfile.spec.ts

lib/manager/bundler/locked-version.spec.ts