test: add comments to console messages that are hidden

HCRC-178

Author: nikomakela

jest-setup.ts

@@ -6,9 +6,13 @@ import { hideConsoleMessages } from './src/tests/hideConsoleMessages';
 
 hideConsoleMessages({
   warn: [
+    // Apollo deprecation message is spammed in tests, just for future info. It's not useful in unit tests.
     /`canonizeResults` is deprecated and will be removed in Apollo Client 4.0. Please remove this option./,
   ],
-  error: [/Could not parse CSS stylesheet/],
+  error: [
+    // CSS stylesheets are not ever parsed by JSDOM, so the message is useless.
+    /Could not parse CSS stylesheet/,
+  ],
 });
 
 fetchMock.enableMocks();