fix: clean up first try disks before arch fallback retry

[Damans227]

Fixes #14235

When a system vm cant be placed on hosts of the preferred architecture, it retries with the other architecture's template. The first try had already made a root disk and network cards for the vm, and nothing removed them. So the vm ended up with two root disks on the same slot and could not start on any host. This removes the first try's disks and network cards before the retry, for both the secondary storage vm and the console proxy.

Test:

KVM lab with one x86 cluster and one disabled aarch64 cluster, an aarch64 system vm template, and system.vm.preferred.architecture=aarch64. Destroy the console proxy so a new one is made. It cant be placed on aarch64, so it retries with the x86 template.

Also added a unit test for the new cleanup step. VirtualMachineManagerImplTest, ConsoleProxyManagerImplTest, SecondaryStorageManagerImplTest and SecondaryStorageManagerTest pass.

Before: the new console proxy keeps both root disks on slot 0 and every start fails:

Allocating Instance from Template: Template {"id":202,"name":"SystemVM Template (KVM) aarch64"} with hostname: v-4-VM and 3 networks
Unable to allocate proxy Console VM instance {"id":4,"instanceName":"v-4-VM"} with Template {"id":202,"name":"SystemVM Template (KVM) aarch64"}
Allocating Instance from Template: Template {"id":3,"name":"SystemVM Template (KVM)"} with hostname: v-4-VM and 3 networks
Unable to start VM on Host {"id":2,"name":"pr14376-n87-kvm-ol8-kvm2"} due to XML error: target 'vda' duplicated for disk sources '/mnt/8a552ad2-a4fe-375e-b1d1-803e4116c517/11d0ae80-ab12-4641-9970-968d3694d415' and '/mnt/ca52e25a-47cf-3f9d-ab89-96187f87b007/b017ec29-bf06-4aa5-987d-cff96135743c'

volume  vm      device_id  state  template
4       v-4-VM  0          Ready  202 (aarch64)
5       v-4-VM  0          Ready  3 (x86)

After: the aarch64 disk is removed before the retry. The console proxy gets one root disk and starts:

volume  vm      device_id  state    template
8       v-6-VM  0          Destroy  202 (aarch64)
9       v-6-VM  0          Ready    3 (x86)

v-6-VM  Running

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 20.21%. Comparing base (68cff97) to head (6bf7f24).

Files with missing lines	Patch %	Lines
...om/cloud/consoleproxy/ConsoleProxyManagerImpl.java	0.00%	1 Missing ⚠️
.../secondarystorage/SecondaryStorageManagerImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #14376   +/-   ##
=========================================
  Coverage     20.21%   20.21%           
- Complexity    20750    20751    +1     
=========================================
  Files          6426     6426           
  Lines        580181   580188    +7     
  Branches      71033    71033           
=========================================
+ Hits         117287   117291    +4     
- Misses       450180   450183    +3     
  Partials      12714    12714           

Flag	Coverage Δ
uitests	3.69% <ø> (ø)
unittests	21.51% <71.42%> (+<0.01%)	⬆️

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 19495

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 19496