Add config setting to set default User Setting for filter join/leave message (#24047)

* initial submit, join/leave message

* i18n-extract

* additional changes for client config

* add unit tests

* fix unit tests

* change tests to use string not bool

* more unit test fixes

* add and fix unit tests

* revert package-lock

* update unit tests

* Update default_config.ts

* fix unit test

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/config.go

@@ -2129,18 +2129,19 @@ func (s *ThemeSettings) SetDefaults() {
 }
 
 type TeamSettings struct {
-	SiteName                  *string `access:"site_customization"`
-	MaxUsersPerTeam           *int    `access:"site_users_and_teams"`
-	EnableUserCreation        *bool   `access:"authentication_signup"`
-	EnableOpenServer          *bool   `access:"authentication_signup"`
-	EnableUserDeactivation    *bool   `access:"experimental_features"`
-	RestrictCreationToDomains *string `access:"authentication_signup"` // telemetry: none
-	EnableCustomUserStatuses  *bool   `access:"site_users_and_teams"`
-	EnableCustomBrand         *bool   `access:"site_customization"`
-	CustomBrandText           *string `access:"site_customization"`
-	CustomDescriptionText     *string `access:"site_customization"`
-	RestrictDirectMessage     *string `access:"site_users_and_teams"`
-	EnableLastActiveTime      *bool   `access:"site_users_and_teams"`
+	SiteName                        *string `access:"site_customization"`
+	MaxUsersPerTeam                 *int    `access:"site_users_and_teams"`
+	EnableJoinLeaveMessageByDefault *bool   `access:"site_users_and_teams"`
+	EnableUserCreation              *bool   `access:"authentication_signup"`
+	EnableOpenServer                *bool   `access:"authentication_signup"`
+	EnableUserDeactivation          *bool   `access:"experimental_features"`
+	RestrictCreationToDomains       *string `access:"authentication_signup"` // telemetry: none
+	EnableCustomUserStatuses        *bool   `access:"site_users_and_teams"`
+	EnableCustomBrand               *bool   `access:"site_customization"`
+	CustomBrandText                 *string `access:"site_customization"`
+	CustomDescriptionText           *string `access:"site_customization"`
+	RestrictDirectMessage           *string `access:"site_users_and_teams"`
+	EnableLastActiveTime            *bool   `access:"site_users_and_teams"`
 	// In seconds.
 	UserStatusAwayTimeout               *int64   `access:"experimental_features"`
 	MaxChannelsPerTeam                  *int64   `access:"site_users_and_teams"`
@@ -2164,6 +2165,10 @@ func (s *TeamSettings) SetDefaults() {
 		s.MaxUsersPerTeam = NewInt(TeamSettingsDefaultMaxUsersPerTeam)
 	}
 
+	if s.EnableJoinLeaveMessageByDefault == nil {
+		s.EnableJoinLeaveMessageByDefault = NewBool(true)
+	}
+
 	if s.EnableUserCreation == nil {
 		s.EnableUserCreation = NewBool(true)
 	}

server/public/model/config_test.go

@@ -335,6 +335,14 @@ func TestTeamSettingsIsValidSiteNameEmpty(t *testing.T) {
 	require.Nil(t, c1.TeamSettings.isValid())
 }
 
+func TestTeamSettingsDefaultJoinLeaveMessage(t *testing.T) {
+	c1 := Config{}
+	c1.SetDefaults()
+
+	// should default to true
+	require.Equal(t, NewBool(true), c1.TeamSettings.EnableJoinLeaveMessageByDefault)
+}
+
 func TestMessageExportSettingsIsValidEnableExportNotSet(t *testing.T) {
 	mes := &MessageExportSettings{}