Migrate CLI E2E tests to Node.js 26

Run the CLI subprocess suites and benchmark tools as native TypeScript with
node:test, and move them under test/e2e-cli.

Update CI and Compose runners, run local smoke tests on Linux, macOS, and
Windows, and collect source-mapped CLI coverage with c8.

utilsdeno/refactor-styles.ts

@@ -102,8 +102,7 @@ for (const sourceFile of project.getSourceFiles()) {
     if (
         posixFilePath.endsWith(".spec.ts") ||
         posixFilePath.endsWith(".test.ts") ||
-        posixFilePath.includes("/_test/") ||
-        posixFilePath.includes("/testdeno/")
+        posixFilePath.includes("/_test/")
     ) {
         continue;
     }