Auth: Passwordless Login Option Using Magic Links (#95436)

* initial passwordless client

* passwordless login page

* Working basic e2e flow

* Add todo comments

* Improve the passwordless login flow

* improved passwordless login, backend for passwordless signup

* add expiration to emails

* update email templates & render username & name fields on signup

* improve email templates

* change login page text while awaiting passwordless code

* fix merge conflicts

* use claims.TypeUser

* add initial passwordless tests

* better error messages

* simplified error name

* remove completed TODOs

* linting & minor test improvements & rename passwordless routes

* more linting fixes

* move code generation to its own func, use locationService to get query params

* fix ampersand in email templates & use passwordless api routes in LoginCtrl

* txt emails more closely match html email copy

* move passwordless auth behind experimental feature toggle

* fix PasswordlessLogin property failing typecheck

* make update-workspace

* user correct placeholder

* Update emails/templates/passwordless_verify_existing_user.txt

Co-authored-by: Dan Cech <dcech@grafana.com>

* Update emails/templates/passwordless_verify_existing_user.mjml

Co-authored-by: Dan Cech <dcech@grafana.com>

* Update emails/templates/passwordless_verify_new_user.txt

Co-authored-by: Dan Cech <dcech@grafana.com>

* Update emails/templates/passwordless_verify_new_user.txt

Co-authored-by: Dan Cech <dcech@grafana.com>

* Update emails/templates/passwordless_verify_new_user.mjml

Co-authored-by: Dan Cech <dcech@grafana.com>

* use &amp; in email templates

* Update emails/templates/passwordless_verify_existing_user.txt

Co-authored-by: Dan Cech <dcech@grafana.com>

* remove IP address validation

* struct for passwordless settings

* revert go.work.sum changes

* mock locationService.getSearch in failing test

---------

Co-authored-by: Mihaly Gyongyosi <mgyongyosi@users.noreply.github.com>
Co-authored-by: Dan Cech <dcech@grafana.com>

pkg/api/dtos/frontend_settings.go

@@ -33,6 +33,7 @@ type FrontendSettingsAuthDTO struct {
 
 	DisableLogin                  bool `json:"disableLogin"`
 	BasicAuthStrongPasswordPolicy bool `json:"basicAuthStrongPasswordPolicy"`
+	PasswordlessEnabled           bool `json:"passwordlessEnabled"`
 }
 
 type FrontendSettingsBuildInfoDTO struct {
@@ -253,6 +254,7 @@ type FrontendSettingsDTO struct {
 	TokenExpirationDayLimit int                                `json:"tokenExpirationDayLimit"`
 	SharedWithMeFolderUID   string                             `json:"sharedWithMeFolderUID"`
 	RootFolderUID           string                             `json:"rootFolderUID"`
+	PasswordlessEnabled     string                             `json:"passwordlessEnabled"`
 
 	GeomapDefaultBaseLayerConfig *map[string]any `json:"geomapDefaultBaseLayerConfig,omitempty"`
 	GeomapDisableCustomBaseLayer bool            `json:"geomapDisableCustomBaseLayer"`