sync: add group filtering

like for manual pulls, but persisted in the sync job config and visible
in the relevant GUI parts.

GUI is read-only for now (and defaults to no filtering on creation), as
this is a rather advanced feature that requires a complex GUI to be
user-friendly (regex-freeform, type-combobox, remote group scanning +
selector with additional freeform input).

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Reviewed-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

www/window/SyncJobEdit.js

@@ -199,6 +199,15 @@ Ext.define('PBS.window.SyncJobEdit', {
 	],
 
 	columnB: [
+	    {
+		fieldLabel: gettext('Backup Groups'),
+		xtype: 'displayfield',
+		name: 'groups',
+		renderer: v => v ? Ext.String.htmlEncode(v) : gettext('All'),
+		cbind: {
+		    hidden: '{isCreate}',
+		},
+	    },
 	    {
 		fieldLabel: gettext('Comment'),
 		xtype: 'proxmoxtextfield',