vmm_tests: Investigate ARM UEFI random failures

[smalis-msft]

ARM UEFI vmm tests rarely randomly fail. Sometimes no information is given on the cause, but sometimes we get this:

Guest message:
MsvmPkg FAIL_FAST
DESCRIPTION: Unexpected host behavior
ERROR: 26
COMPONENT: D:\a\mu_msvm\mu_msvm\MsvmPkg\VmbusDxe\VmbusRoot.c
LINE: 1006

Investigation is ongoing.

[smalis-msft]

Once this is fixed #2105 should be reverted.

[smalis-msft]

Closing in favor of #2139