Settings: Add setting for hiding version number for anonymous users (#24919)

* Settings: Add setting for hiding version number for anonymous users

Fixes #12925

* Hide version string from footer when unavailable

* Settings: Test frontend settings with hide version for anonymous users

* Settings: Add hide version variable to frontend settings

* Make AnonymousHideVersion non-global

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Settings: Improve test neighbor friendliness, reset state before and after

* Settings: Use T.Cleanup

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/setting/setting.go

@@ -296,6 +296,8 @@ type Cfg struct {
 
 	// Use to enable new features which may still be in alpha/beta stage.
 	FeatureToggles map[string]bool
+
+	AnonymousHideVersion bool
 }
 
 // IsExpressionsEnabled returns whether the expressions feature is enabled.
@@ -873,6 +875,7 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 	if err != nil {
 		return err
 	}
+	cfg.AnonymousHideVersion = iniFile.Section("auth.anonymous").Key("hide_version").MustBool(false)
 
 	// auth proxy
 	authProxy := iniFile.Section("auth.proxy")