Update list of workflows in the cancel previous job.

[aaemnnosttv]

Summary

Addresses issue #

Adds missing updates to the cancel workflow:

• compressed-size.yml Extract Bundlesize to its own job/check #2539
• php-tests-wp-latest-php-8-0.yml Allow PHP8 #2724

Relevant technical choices

Checklist

• My code is tested and passes existing unit tests.
• My code has an appropriate set of unit tests which all pass.
• My code is backward-compatible with WordPress 4.7 and PHP 5.6.
• My code follows the WordPress coding standards.
• My code has proper inline documentation.
• I have added a QA Brief on the issue linked above.
• I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

[aaemnnosttv]

Closing this out as no longer needed due to changes in workflow structure.