feat(platform/bitbucket): autodiscoverProjects (#27845)

docs/usage/self-hosted-configuration.md

lib/config/options/index.ts

lib/config/types.ts

lib/modules/platform/bitbucket/index.spec.ts

lib/modules/platform/bitbucket/index.ts

lib/modules/platform/bitbucket/types.ts

lib/modules/platform/types.ts

lib/workers/global/autodiscover.ts