fix(eslint): Restrict the rules and fix errors (#7117)

.eslintrc.js

lib/versioning/hex/index.ts

lib/versioning/npm/range.ts

lib/versioning/poetry/index.ts

lib/workers/branch/check-existing.ts

lib/workers/branch/index.spec.ts

lib/workers/branch/index.ts

lib/workers/branch/reuse.ts

lib/workers/branch/schedule.ts

lib/workers/common.ts

lib/workers/global/index.ts

lib/workers/pr/body/config-description.ts

lib/workers/pr/changelog/github/index.ts

lib/workers/pr/changelog/gitlab/index.ts

lib/workers/pr/index.ts

lib/workers/repository/dependency-dashboard.ts

lib/workers/repository/finalise/prune.ts

lib/workers/repository/init/config.ts

lib/workers/repository/init/vulnerability.ts

lib/workers/repository/onboarding/pr/config-description.ts