[Chapel Merge] Follow convention when specifying an executable sk

Branch: refs/heads/main
Revision: adb9d95
Author: gbtitus
Log Message:

Merge pull request #18375 from gbtitus/fix-task-report-sanity.skipif

Follow convention when specifying an executable skipif's shell.

(Not reviewed -- fixes retrospectively obvious flaw in one test's .skipif file.)

I specified /bin/sh as the shell for a new executable .skipif file, but
then used bash-specific syntax in its body. That "worked" on a system
where /bin/sh was a symbolic link to bash, but broke on a another one
where it was not. Here, specify bash as the shell, and do it in a more
conventional way.

Modified Files:
M test/parallel/reports/task-report-sanity.skipif

Compare: https://github.com/chapel-lang/chapel/compare/ddb222003300...adb9d95689ef