doc(contributing): Add warning for test --all (#9338)

Author: zrosenbauer

CONTRIBUTING.md

@@ -124,6 +124,8 @@ For running all tests, take the following steps:
     cargo test --all --no-default-features --features swc_v2 --features filesystem_cache
     ```
 
+    **TIP**: If you see errors while attempting to run the commands above, we usually do not run all tests at once. Instead, we run tests per package ([see below](#running-tests-per-package)), which you can use to verify your local setup.
+
 ## Running tests per package
 
 While working on specific packages, individual tests can be run by specifying a package to the