Ubuntu 22.04 integration: ShellCheck

• Add new SC2312 global exclude. ` Consider invoking this command separately to avoid masking its return value (or use '|| true' to ignore). [SC2312] `

• Correct errors detected by new ShellCheck version.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Closes #14148