test(ci): refine test suite name unique (vercel#54013)

### What

Pairing PR to vercel/turborepo#5714, which I believe last piece to reenable correct datadog test reports for daily next.js integration + turbopack.

1. Creates a unique suite name to avoid collision / merging across different env / grouped test run
2. revert suitename template (which is for _suites_, not _suite_ for top level) as 1 resolves uniqueness

jest.config.js

@@ -30,9 +30,7 @@ const customJestConfig = {
 // This won't count for the retry to avoid duplicated test being reported twice
 // - which means our test trace will report test results for the flaky test as failed without retry.
 const shouldEnableTestTrace =
-  process.env.DATADOG_API_KEY &&
-  process.env.DATADOG_TRACE_NEXTJS_TEST &&
-  !process.env.IS_RETRY
+  process.env.DATADOG_API_KEY && process.env.DATADOG_TRACE_NEXTJS_TEST
 
 if (shouldEnableTestTrace) {
   if (!customJestConfig.reporters) {
@@ -48,11 +46,6 @@ if (shouldEnableTestTrace) {
     'jest-junit',
     {
       outputDirectory,
-      // note: {filename} is not a full path, since putting full path
-      // makes suite name too long and truncates and not able to read the suite name
-      suiteNameTemplate: `{title} [${process.env.NEXT_TEST_MODE ?? 'default'}${
-        process.env.TURBOPACK ? '/t' : ''
-      }${process.env.EXPERIMENTAL_TURBOPACK ? '/et' : ''}/{filename}]`,
       reportTestSuiteErrors: 'true',
       uniqueOutputName: 'true',
       outputName: 'nextjs-test-junit',

run-tests.js

@@ -278,6 +278,7 @@ async function main() {
   console.log(`${GROUP}Running tests:
 ${testNames.join('\n')}
 ${ENDGROUP}`)
+  console.log(`total: ${testNames.length}`)
 
   const hasIsolatedTests = testNames.some((test) => {
     return configuredTestTypes.some(
@@ -365,6 +366,22 @@ ${ENDGROUP}`)
             CONTINUOUS_INTEGRATION: '',
             RUN_ID: '',
             BUILD_NUMBER: '',
+            // Format the output of junit report to include the test name
+            // For the debugging purpose to compare actual run list to the generated reports
+            // [NOTE]: This won't affect if junit reporter is not enabled
+            JEST_JUNIT_OUTPUT_NAME:
+              test && test.length > 0 ? test.replaceAll('/', '_') : undefined,
+            // Specify suite name for the test to avoid unexpected merging across different env / grouped tests
+            // This is not individual suites name (corresponding 'describe'), top level suite name which have redundant names by default
+            // [NOTE]: This won't affect if junit reporter is not enabled
+            JEST_SUITE_NAME: [
+              `${process.env.NEXT_TEST_MODE ?? 'default'}`,
+              groupArg,
+              testType,
+              test,
+            ]
+              .filter(Boolean)
+              .join(':'),
             ...(isFinalRun
               ? {
                   // Events can be finicky in CI. This switches to a more