Fix: AttributeError: 'MicroVM' object has no attribute 'send_shutdown_message'

[hoh]

Error reported on #652

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 61.22%. Comparing base (4a9eabd) to head (478be7f).

Files	Patch %	Lines
src/aleph/vm/controllers/__main__.py	0.00%	3 Missing ⚠️
src/aleph/vm/hypervisors/qemu/qemuvm.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #653      +/-   ##
==========================================
- Coverage   61.25%   61.22%   -0.03%     
==========================================
  Files          65       65              
  Lines        5603     5607       +4     
  Branches      596      596              
==========================================
+ Hits         3432     3433       +1     
- Misses       2023     2026       +3     
  Partials      148      148              

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