You can 'sudo snap connect chromium:mount-observe' for /etc/fstab.
/run/mount/utab is more complicated and you can read about it here:
https://forum.snapcraft.io/t/namespace-awareness-of-run-mount-utab-and-
libmount/5987
For the /run/udev/data accesses, can you paste the output of:
$ cat /run/udev/data/b230\:*
** Package changed: chromium-browser (Ubuntu) => snapd (Ubuntu)
** Changed in: snapd (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1828275
Title:
[snap] chromium generates a lot of Apparmor noise
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