feat: add support for coder_git_auth data source (#6334)

* Add git auth providers schema

* Pipe git auth providers to the schema

* Add git auth providers to the API

* Add gitauth endpoint to query authenticated state

* Add endpoint to query git state

* Use BroadcastChannel to automatically authenticate with Git

* Add error validation for submitting the create workspace form

* Fix panic on template dry-run

* Add tests for the template version Git auth endpoint

* Show error if no gitauth is configured

* Add gitauth to cliui

* Fix unused method receiver

* Fix linting errors

* Fix dbauthz querier test

* Fix make gen

* Add JavaScript test for git auth

* Fix bad error message

* Fix provisionerd test race

See https://github.com/coder/coder/actions/runs/4277960646/jobs/7447232814

* Fix requested changes

* Add comment to CreateWorkspacePageView

coderd/coderd.go

@@ -489,6 +489,7 @@ func New(options *Options) *API {
 			r.Get("/schema", api.templateVersionSchema)
 			r.Get("/parameters", api.templateVersionParameters)
 			r.Get("/rich-parameters", api.templateVersionRichParameters)
+			r.Get("/gitauth", api.templateVersionGitAuth)
 			r.Get("/variables", api.templateVersionVariables)
 			r.Get("/resources", api.templateVersionResources)
 			r.Get("/logs", api.templateVersionLogs)
@@ -805,12 +806,18 @@ func (api *API) CreateInMemoryProvisionerDaemon(ctx context.Context, debounce ti
 	}
 
 	mux := drpcmux.New()
+
+	gitAuthProviders := make([]string, 0, len(api.GitAuthConfigs))
+	for _, cfg := range api.GitAuthConfigs {
+		gitAuthProviders = append(gitAuthProviders, cfg.ID)
+	}
 	err = proto.DRPCRegisterProvisionerDaemon(mux, &provisionerdserver.Server{
 		AccessURL:          api.AccessURL,
 		ID:                 daemon.ID,
 		Database:           api.Database,
 		Pubsub:             api.Pubsub,
 		Provisioners:       daemon.Provisioners,
+		GitAuthProviders:   gitAuthProviders,
 		Telemetry:          api.Telemetry,
 		Tags:               tags,
 		QuotaCommitter:     &api.QuotaCommitter,