Improve step description when compile-webkit step is skipped

https://bugs.webkit.org/show_bug.cgi?id=224373

Reviewed by Jonathan Bedard.

* CISupport/ews-build/steps.py:
(CompileWebKit.getResultSummary): Set custom summary when this step is skipped.
* CISupport/ews-build/steps_unittest.py: Updated unit-tests.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@275795 268f45cc-cd09-0410-ab3c-d52691b4dbfc
commit06f647b93206d420d6f1e9252b0a69bcd446dce3
parent2fc5639040164bdcdca2b71980dad0e3c477f5fd
git06f647b93206d420d6f1e9252b0a69bcd446dce3
authoraakash_jain@apple.com <aakash_jain@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
committeraakash_jain@apple.com <aakash_jain@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
commit timeSat, 10 Apr 2021 11:20:51 +0000