feat(config): rename stabilityDays to minimumReleaseAge (#21376)

docs/usage/configuration-options.md

...config/migrations/custom/stability-days-migration.spec.ts

lib/config/migrations/custom/stability-days-migration.ts

lib/config/migrations/migrations-service.ts

lib/config/options/index.ts

lib/config/presets/internal/npm.ts

lib/util/date.spec.ts

lib/util/date.ts

lib/util/pretty-time.spec.ts

.../repository/init/__snapshots__/vulnerability.spec.ts.snap

...y/process/lookup/__snapshots__/filter-checks.spec.ts.snap

lib/workers/repository/process/lookup/filter-checks.spec.ts

lib/workers/repository/process/lookup/filter-checks.ts

lib/workers/repository/process/lookup/index.spec.ts

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

lib/workers/repository/update/branch/index.ts

lib/workers/repository/update/branch/status-checks.ts