[MM-33908] Resync LDAP Groups to Teams and Channels (#17372)

* add includeRemovedMembers flag

* fix API call in client4.go

* remove check for 'since'

* add comments

* run make app-layers

* re-run CI tests

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/client4.go

@@ -4033,8 +4033,13 @@ func (c *Client4) GetClusterStatus() ([]*ClusterInfo, *Response) {
 // LDAP Section
 
 // SyncLdap will force a sync with the configured LDAP server.
-func (c *Client4) SyncLdap() (bool, *Response) {
-	r, err := c.DoApiPost(c.GetLdapRoute()+"/sync", "")
+// If includeRemovedMembers is true, then group members who left or were removed from a
+// synced team/channel will be re-joined; otherwise, they will be excluded.
+func (c *Client4) SyncLdap(includeRemovedMembers bool) (bool, *Response) {
+	reqBody, _ := json.Marshal(map[string]interface{}{
+		"include_removed_members": includeRemovedMembers,
+	})
+	r, err := c.doApiPostBytes(c.GetLdapRoute()+"/sync", reqBody)
 	if err != nil {
 		return false, BuildErrorResponse(r, err)
 	}