Migrate from CommonJS to ESM (#6651)

services/azure-devops/azure-devops-coverage.tester.js

@@ -1,7 +1,6 @@
-'use strict'
-
-const { isIntegerPercentage } = require('../test-validators')
-const t = (module.exports = require('../tester').createServiceTester())
+import { isIntegerPercentage } from '../test-validators.js'
+import { createServiceTester } from '../tester.js'
+export const t = await createServiceTester()
 
 const org = 'swellaby'
 const project = 'opensource'