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;
 }

test/slowReporter.js → test/slowReporter.cjs

@@ -14,4 +14,4 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-module.exports = require("matrix-js-sdk/spec/slowReporter");
+module.exports = require("matrix-js-sdk/spec/slowReporter.cjs");