Add an option to hide certain users in the UI (#28942)

* Add an option to hide certain users in the UI

* revert changes for admin users routes

* fix sqlstore function name

* Improve slice management

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>

* Hidden users: convert slice to map

* filter with user logins instead of IDs

* put HiddenUsers in Cfg struct

* hide hidden users from dashboards/folders permissions list

* Update conf/defaults.ini

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

* fix params order

* fix tests

* fix dashboard/folder update with hidden user

* add team tests

* add dashboard and folder permissions tests

* fixes after merge

* fix tests

* API: add test for org users endpoints

* update hidden users management for dashboard / folder permissions

* improve dashboard / folder permissions tests

* fixes after merge

* Guardian: add hidden acl tests

* API: add team members tests

* fix team sql syntax for postgres

* api tests update

* fix linter error

* fix tests errors after merge

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.com>
Co-authored-by: Leonard Gram <leo@xlson.com>

pkg/setting/setting.go

@@ -308,6 +308,7 @@ type Cfg struct {
 
 	// User
 	UserInviteMaxLifetime time.Duration
+	HiddenUsers           map[string]struct{}
 
 	// Annotations
 	AlertingAnnotationCleanupSetting   AnnotationCleanupSettings
@@ -1118,6 +1119,13 @@ func readUserSettings(iniFile *ini.File, cfg *Cfg) error {
 		return errors.New("the minimum supported value for the `user_invite_max_lifetime_duration` configuration is 15m (15 minutes)")
 	}
 
+	cfg.HiddenUsers = make(map[string]struct{})
+	hiddenUsers := users.Key("hidden_users").MustString("")
+	for _, user := range strings.Split(hiddenUsers, ",") {
+		user = strings.TrimSpace(user)
+		cfg.HiddenUsers[user] = struct{}{}
+	}
+
 	return nil
 }