Enable Multisite test runner on GA

[jakejackson1]

Description

GA wasn't running out multisite PHPUnit test. This PR fixes that and patches an issue with one of the multi-site specific tests

Testing instructions

Automated testing suite.

Screenshots

Checklist:

• [ ] I've tested the code.
• [ ] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [ ] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Merging #1390 (db13c1a) into development (8613cdc) will not change coverage. The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #1390   +/-   ##
============================================
  Coverage        93.30%   93.30%           
============================================
  Files               57       57           
  Lines             1464     1464           
  Branches           370      370           
============================================
  Hits              1366     1366           
  Misses              90       90           
  Partials             8        8           

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