server: allow migration of vm with snapshots for vmware

Description

Fixes #9061

Types of changes

[ ] Breaking change (fix or feature that would cause existing functionality to change)
[ ] New feature (non-breaking change which adds functionality)
[ ] Bug fix (non-breaking change which fixes an issue)
[x] Enhancement (improves an existing feature and functionality)
[ ] Cleanup (Code refactoring and cleanup, that may add test cases)
[ ] build/CI
[ ] test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

[ ] Major
[ ] Minor

Bug Severity

[ ] BLOCKER
[ ] Critical
[ ] Major
[ ] Minor
[ ] Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 15.42%. Comparing base (3a0c312) to head (48c23be). Report is 36 commits behind head on main.

Files	Patch %	Lines
.../src/main/java/com/cloud/vm/UserVmManagerImpl.java	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #9305 +/- ## ============================================ - Coverage 15.42% 15.42% -0.01% Complexity 11818 11818 ============================================ Files 5474 5474 Lines 478602 478604 +2 Branches 62097 60293 -1804 ============================================ Hits 73823 73823 - Misses 396649 396650 +1 - Partials 8130 8131 +1 ``` | [Flag](https://app.codecov.io/gh/apache/cloudstack/pull/9305/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | Coverage Δ | | |---|---|---| | [uitests](https://app.codecov.io/gh/apache/cloudstack/pull/9305/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `4.18% <ø> (ø)` | | | [unittests](https://app.codecov.io/gh/apache/cloudstack/pull/9305/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache) | `16.18% <33.33%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=apache#carryforward-flags-in-the-pull-request-comment) to find out more.

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apache / cloudstack