NAS-133481 / 25.04 / Changes for VMs in new virtualization

[denysbutenko]

Changes:

1. Makes CPU and Memory attributes required again.
2. Update Disks picker, remove destionation and allows to pick zvols only.
3. Updated ix-explorer allows to list zvols only.

Testing:

Checks Instance Wizard on Virtualization page.

Downstream

Affects	Reasoning
Documentation	Instance Wizard changes

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-133481

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.74%. Comparing base (5faa6c2) to head (bc1c56c).
Report is 5 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/app/services/filesystem.service.ts	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11323      +/-   ##
==========================================
- Coverage   82.75%   82.74%   -0.01%     
==========================================
  Files        1654     1654              
  Lines       59133    59134       +1     
  Branches     6210     6217       +7     
==========================================
- Hits        48936    48933       -3     
- Misses      10197    10201       +4     

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