Rename all the slow reporter stuff to cjs (#12933)

To hopefully fix tests on develop

jest.config.ts

@@ -53,7 +53,7 @@ if (env["GITHUB_ACTIONS"] !== undefined) {
 
     // if we're running against the develop branch, also enable the slow test reporter
     if (env["GITHUB_REF"] == "refs/heads/develop") {
-        reporters.push("<rootDir>/test/slowReporter.js");
+        reporters.push("<rootDir>/test/slowReporter.cjs");
     }
     config.reporters = reporters;
 }