MM-20644: Add users to teams as a SchemeAdmin based on a new configuration field on GroupTeams and GroupChannels records. (#13361)

* MM-20644: Add users to teams as a SchemeAdmin based on a new configuration field on GroupTeams and GroupChannels records.

* MM-20644: Adds SchemeAdmin to mapping of the GroupSyncable struct fields.

* MM-2064: Adds test to ensure SchemeAdmin field value is mapped.

* MM-20644: Adds missing index creation for fresh DBs.

* MM-20644: Duplicates UpdateMembersRole across Team and Channel stores. Adds tests.

* MM-20644: Fixes some old method name references.

* MM-20644: Moves variable declaration; removes Println statement.

* MM-20644: Use a SQL query instead of two to update Team and Channel members.

* MM-20644: Fixes tests; updates query.

* MM-20644: Fix permission check for patching a group syncable.

* MM-20644: Fixes test for change of permissions verification in group patch API request.

* MM-20644: Fix for ORM select vs insert.

* MM-20644: Linting fixes.

* MM-20644: Fixes some tests.

* MM-20644: Skips changing the role of guests.

* MM-20644: Added syncableID filtering

model/group.go

@@ -43,6 +43,11 @@ type Group struct {
 	MemberCount  *int        `db:"-" json:"member_count,omitempty"`
 }
 
+type GroupWithSchemeAdmin struct {
+	Group
+	SchemeAdmin *bool `db:"SyncableSchemeAdmin" json:"scheme_admin,omitempty"`
+}
+
 type GroupPatch struct {
 	Name        *string `json:"name"`
 	DisplayName *string `json:"display_name"`