Don't let plugins fail due to read-only fs #3239
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Read-only file systems fall into the same category as unsupported ones (i.e. writing the desired file metadata to them is meaningless) so handle those gracefully in the plugin hooks, too.
This is useful e.g. when preparing a system for IMA by reinstalling the desired packages with the IMA plugin enabled, including ones that own paths such as /mnt which are meant to be used as mount points, often read-only (e.g. when mounting an ISO).
Fixes: RHEL-33726