Plugin groups (#30320)

* add new pluginapi methods

* SAML login hook

* set ReAddRemovedMembers to true for plugin groups

* change to DoLogin signature for SAML

server/public/model/client4.go

@@ -5862,7 +5862,7 @@ func (c *Client4) GetGroupsAssociatedToChannelsByTeam(ctx context.Context, teamI
 // GetGroups retrieves Mattermost Groups
 func (c *Client4) GetGroups(ctx context.Context, opts GroupSearchOpts) ([]*Group, *Response, error) {
 	path := fmt.Sprintf(
-		"%s?include_member_count=%v&not_associated_to_team=%v&not_associated_to_channel=%v&filter_allow_reference=%v&q=%v&filter_parent_team_permitted=%v&group_source=%v&include_channel_member_count=%v&include_timezones=%v&include_archived=%v&filter_archived=%v",
+		"%s?include_member_count=%v&not_associated_to_team=%v&not_associated_to_channel=%v&filter_allow_reference=%v&q=%v&filter_parent_team_permitted=%v&group_source=%v&include_channel_member_count=%v&include_timezones=%v&include_archived=%v&filter_archived=%v&only_syncable_sources=%v",
 		c.groupsRoute(),
 		opts.IncludeMemberCount,
 		opts.NotAssociatedToTeam,
@@ -5875,6 +5875,7 @@ func (c *Client4) GetGroups(ctx context.Context, opts GroupSearchOpts) ([]*Group
 		opts.IncludeTimezones,
 		opts.IncludeArchived,
 		opts.FilterArchived,
+		opts.OnlySyncableSources,
 	)
 	if opts.Since > 0 {
 		path = fmt.Sprintf("%s&since=%v", path, opts.Since)