Summary: EXPECT_MATCH is something I've wnated to do, but never did. It's a nice replacment for EXPECT_TRUE(Match(...)) because it's shorter and provides a better error message.

Test Plan: Tested in follow up diff

Reviewers: nserrino, zasgar, #engineering

Reviewed By: zasgar, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D4468

GitOrigin-RevId: 4062875b21587b7b91f73ad0df137203212418e9