[test optimization] Do not retry if test isolation is not enabled in cypress (#6978)

Author: juan-fernandez

integration-tests/cypress-esm-config.mjs

@@ -5,6 +5,7 @@ async function runCypress () {
     config: {
       defaultCommandTimeout: 1000,
       e2e: {
+        testIsolation: process.env.CYPRESS_TEST_ISOLATION !== 'false',
         setupNodeEvents (on, config) {
           if (process.env.CYPRESS_ENABLE_INCOMPATIBLE_PLUGIN) {
             import('cypress-fail-fast/plugin').then(module => {

integration-tests/cypress.config.js

@@ -8,6 +8,7 @@ const ddTracePlugin = require('dd-trace/ci/cypress/plugin')
 module.exports = {
   defaultCommandTimeout: 1000,
   e2e: {
+    testIsolation: process.env.CYPRESS_TEST_ISOLATION !== 'false',
     setupNodeEvents (on, config) {
       if (process.env.CYPRESS_ENABLE_INCOMPATIBLE_PLUGIN) {
         cypressFailFast(on, config)