feat: allow external services to be authable (#9996)

* feat: allow external services to be authable

* Refactor external auth config structure for defaults

* Add support for new config properties

* Change the name of external auth

* Move externalauth -> external-auth

* Run gen

* Fix tests

* Fix MW tests

* Fix git auth redirect

* Fix lint

* Fix name

* Allow any ID

* Fix invalid type test

* Fix e2e tests

* Fix comments

* Fix colors

* Allow accepting any type as string

* Run gen

* Fix href

cmd/cliui/main.go

@@ -331,17 +331,17 @@ func main() {
 				// Complete the auth!
 				gitlabAuthed.Store(true)
 			}()
-			return cliui.GitAuth(inv.Context(), inv.Stdout, cliui.GitAuthOptions{
+			return cliui.ExternalAuth(inv.Context(), inv.Stdout, cliui.ExternalAuthOptions{
 				Fetch: func(ctx context.Context) ([]codersdk.TemplateVersionExternalAuth, error) {
 					count.Add(1)
 					return []codersdk.TemplateVersionExternalAuth{{
 						ID:              "github",
-						Type:            codersdk.ExternalAuthProviderGitHub,
+						Type:            codersdk.EnhancedExternalAuthProviderGitHub.String(),
 						Authenticated:   githubAuthed.Load(),
 						AuthenticateURL: "https://example.com/gitauth/github?redirect=" + url.QueryEscape("/gitauth?notify"),
 					}, {
 						ID:              "gitlab",
-						Type:            codersdk.ExternalAuthProviderGitLab,
+						Type:            codersdk.EnhancedExternalAuthProviderGitLab.String(),
 						Authenticated:   gitlabAuthed.Load(),
 						AuthenticateURL: "https://example.com/gitauth/gitlab?redirect=" + url.QueryEscape("/gitauth?notify"),
 					}}, nil