CI: run only sanity check on limited OSes for nonbehavioral changes

The commit uses heuristics to determine whether a PR is behavioral:

It runs "quick" CI (i.e., only use sanity.run on fewer OSes)
if (explicitly requested by user):

• the *last* commit message contains a line 'ZFS-CI-Type: quick',

or if (by heuristics):

• the files changed are not in the list of specified directory, and
• all commit messages does not contain 'ZFS-CI-Type: full'.

It runs "full" CI otherwise.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Shengqi Chen <harry-chen@outlook.com>
Closes #16564