[Chapel Merge] Fix the custom sub_test for mason packages

Branch: refs/heads/main
Revision: 3e7f0019622a6903e3e973d315a59ce5c2015365
Author: jabraham17
Link: Fix the custom sub_test for mason packages by jabraham17 · Pull Request #28872 · chapel-lang/chapel · GitHub
Log Message:
Fix the custom sub_test for mason packages (#28872)

Fixes the custom sub_test for mason packages so that it properly parses

[Reviewed by @DanilaFe]

Compare: Comparing 6ea4d7ab61d83f635cfa2a52fb5c70e72c86b7f5...b01e62889a41e4e30d67fbb4841ac076c627f889 · chapel-lang/chapel · GitHub

Diff:
M test/library/mason/MasonPackageTester
https://github.com/chapel-lang/chapel/pull/28872.diff