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tests: update the detailed exit codes for icasefs gated tests

Authored by mharbison72.

Description

tests: update the detailed exit codes for icasefs gated tests

The fact that there's already a detailed exit code after the last change here in
test-casecollision-merge.t gives me some pause, but maybe it was found and
changed manually?

Differential Revision: https://phab.mercurial-scm.org/D10298