manila-ganesha charm should check nfs-ganesha package version/functionality and block the upgrade if prerequisites are not met

[Nobuto Murata]

https://review.opendev.org/c/openstack/charm-guide/+/801025
> Manila-Ganesha requires updates package
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> To fix long-standing issues in the manila-ganesha charm's service related to
> `manila exporting shares after restart`_, updates to both the charm and
> Ubuntu packages were required.
>
> It is necessary to ensure that the nfs-ganesha package is up to date before
> upgrading the manila-ganesha charm.

The new manila-ganesha charm has a new architecture and relies on the SRUed packages of nfs-ganesha. That's called out in the release notes now explicitly which is good. However, it would be good if the charm checks the package version/functionality in the upgrade-charm phase, and blocks the status explicitly to notify the users that packages need to be updated.

[Nobuto Murata (nobuto)]

This has been opened on behalf of our support team based on their feedback in the recent handover.