[MM-26574] Add role filters to get users, users search and add getFilteredUserStats endpoint (#14998)

* MM-26574 Add role filters to user search and get

* Add ability to get filtered user stats

Add support for include bots

* Add tests for user count with filters

Add tests

* Apply changes from code review

* Fix guest filtering

* Fix up tests related to guests

* Clean role names

* Trigger CI

* Trigger CI

app/app_iface.go

@@ -157,6 +157,8 @@ type AppIface interface {
 	GetEmojiStaticUrl(emojiName string) (string, *model.AppError)
 	// GetEnvironmentConfig returns a map of configuration keys whose values have been overridden by an environment variable.
 	GetEnvironmentConfig() map[string]interface{}
+	// GetFilteredUsersStats is used to get a count of users based on the set of filters supported by UserCountOptions.
+	GetFilteredUsersStats(options *model.UserCountOptions) (*model.UsersStats, *model.AppError)
 	// GetGroupsByTeam returns the paged list and the total count of group associated to the given team.
 	GetGroupsByTeam(teamId string, opts model.GroupSearchOpts) ([]*model.GroupWithSchemeAdmin, int, *model.AppError)
 	// GetKnownUsers returns the list of user ids of users with any direct