refactor: better manager types (#15708)

lib/config/index.ts

lib/config/types.ts

lib/modules/manager/index.spec.ts

lib/modules/manager/index.ts

lib/modules/manager/types.ts

lib/workers/repository/extract/index.ts

lib/workers/repository/extract/manager-files.spec.ts

lib/workers/repository/extract/manager-files.ts

lib/workers/repository/onboarding/pr/pr-list.spec.ts

lib/workers/repository/process/extract-update.spec.ts

lib/workers/repository/update/branch/artifacts.spec.ts

...itory/update/branch/execute-post-upgrade-commands.spec.ts

...repository/update/branch/execute-post-upgrade-commands.ts

lib/workers/repository/update/branch/reuse.spec.ts

lib/workers/repository/update/pr/body/changelogs.spec.ts

...kers/repository/update/pr/body/config-description.spec.ts

lib/workers/repository/update/pr/body/footer.spec.ts

lib/workers/repository/update/pr/body/header.spec.ts

lib/workers/repository/update/pr/body/index.spec.ts

lib/workers/repository/update/pr/body/notes.spec.ts