test: explain sloppy mode for test-global
Add a comment explaining why test-global runs in sloppy mode rather than strict mode. While in the file, make some minor changes to the module ordering and spacing to conform with our test writing guide.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test