MM-14412: Enables force removals of team/channel members base on group constraints. (#10490)

* MM-14412: Enables force removals of team/channel members base on group constraints.

* Renames some existing methods and variables.

* Change return types to ChannelMembers and TeamMembers for some existing methods.

* Adds option to change LDAP_DATA to either 'qa' or 'test' with env variable.

* Adds methods to retrieve ChannelMembers and TeamMembers that, based on group constraints, should be deleted.

* Adds helper functions to create GroupTeams and GroupChannels.

* MM-14412: Switches to helper methods for GroupSyncable creation in test files.

* MM-14412: Style fix.

* MM-14412: Switches remaining GroupSyncable instances to be created with helper functions.

* MM-14412: Typo fix.

* MM-11412: Build fixes.

* MM-14412: Checks if user is team member before re-adding.

* MM-14412: Update for change of GroupConstrained fields type.

store/sqlstore/upgrade.go

@@ -640,6 +640,9 @@ func UpgradeDatabaseToVersion510(sqlStore SqlStore) {
 		sqlStore.CreateColumnIfNotExistsNoDefault("Channels", "GroupConstrained", "tinyint(4)", "boolean")
 		sqlStore.CreateColumnIfNotExistsNoDefault("Teams", "GroupConstrained", "tinyint(4)", "boolean")
 
+		sqlStore.CreateIndexIfNotExists("idx_groupteams_teamid", "GroupTeams", "TeamId")
+		sqlStore.CreateIndexIfNotExists("idx_groupchannels_channelid", "GroupChannels", "ChannelId")
+
 		saveSchemaVersion(sqlStore, VERSION_5_10_0)
 	}
 }