[TIME-3146] Create new xero-payroll-au-v2.yaml spec

This implements the 2.0 endpoints for Timesheets in AU Payroll

(cherry picked from commit 636eabb)

Author: Kurt Lim

manifest.json

@@ -27,6 +27,10 @@
       "path": "/xero-payroll-au.yaml",
       "canPreview": true
     },
+    "payrollAuV2": {
+      "path": "/xero-payroll-au-v2.yaml",
+      "canPreview": true
+    },
     "payrollNz": {
       "path": "/xero-payroll-nz.yaml",
       "canPreview": true