Add function that Unmount Cloud ISO if not needed

[mcbenjemaa]

This PR:

• Adds a function UnmountCloudInitISO to unattach and delete the cloudinit iso.

Closes #127

[mcbenjemaa]

@luthermonson can you have a look,
and can we release this?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 26.90%. Comparing base (fdb95a1) to head (55a167c).
Report is 15 commits behind head on main.

❗ Current head 55a167c differs from pull request most recent head 1ce446d. Consider uploading reports for the commit 1ce446d to get more accurate results

Files	Patch %	Lines
virtual_machine.go	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   25.95%   26.90%   +0.95%     
==========================================
  Files          15       15              
  Lines        1753     1966     +213     
==========================================
+ Hits          455      529      +74     
- Misses       1278     1403     +125     
- Partials       20       34      +14     

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[luthermonson]

looks great, one last quick change if you don't mind

[luthermonson]

https://github.com/luthermonson/go-proxmox/releases/tag/v0.0.0-beta6 here you go @mcbenjemaa