NAS-130966 / 25.04 / Make sure we delete any app volume mount datasets created on app install failure

[sonicaj]

This PR adds changes to remove any app volume mount datasets created during installation in the event installation process failed for whatever reason. We are picky on this end and make sure we only remove them if the app volume dataset didn't exist before as when a user deletes an app, it's optional for him/her to remove the app volume mounts datasets and we don't want them nuked if a user installs an app with the same name and app install fails for whatever reason.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-130966

[Dremor]

I have a question : Will we be able to remove ti ix-volumes if we remove an app without choosing to remove the ix-volume at that time ? I'm currently stuck with multiple ix-volumes I cannot remove, and would like to be able to remove them.

[bugclerk]

This PR has been merged and conversations have been locked.
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[sonicaj]

I have a question : Will we be able to remove ti ix-volumes if we remove an app without choosing to remove the ix-volume at that time ? I'm currently stuck with multiple ix-volumes I cannot remove, and would like to be able to remove them.

@Dremor we would be adding some changes for FangTooth on this end so users can remove any ix-volumes which are not associated with any installed app.