test: unexpected-error test expects non-colored output

The assertions in unexpected-error.spec.ts expect the output being tested to not contain ANSI color codes. To ensure that is always the case, set FORCE_COLOR="0" so node doesn't output colors.

Without this change, this test will pass or fail depending upon the terminal being used to run the tests. With this change, the test runs consistently.

test/jest/unit/lib/unexpected-error.spec.ts

@@ -15,7 +15,8 @@ import { getFixturePath } from '../../util/getFixturePath';
 describe('callHandlingUnexpectedErrors', () => {
   async function runScript(filename: string) {
     const file = path.resolve(getFixturePath('unexpected-error'), filename);
-    return runCommand('node', ['-r', 'ts-node/register', file]);
+    const options = { env: { FORCE_COLOR: "0" } };
+    return runCommand('node', ['-r', 'ts-node/register', file], options);
   }
 
   it('calls the provided callable', async () => {