Return repository in npm package metadata endpoint (#23539)

Close #23444 

Add `Repository` to npm package `Metadata` struct so the `repository` in
`package.json` can be stored and be returned in the endpoint.

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

routers/api/packages/npm/api.go

@@ -45,6 +45,7 @@ func createPackageMetadataResponse(registryURL string, pds []*packages_model.Pac
 		Author:      npm_module.User{Name: metadata.Author},
 		License:     metadata.License,
 		Versions:    versions,
+		Repository:  metadata.Repository,
 	}
 }