I can't delete model with cross relation in vsphere environment.

[Seyeong Kim]

[Impact]

I can't delete model if there is cross relation.

Please check test case.

Thanks.

[Test Case]

I built vsphere env previously.

1. juju 2.8.0
2. vcenter server 7.0.0.10300
3. vmware ESXi 7.0.0 15843807
4. test script.
- https://pastebin.ubuntu.com/p/P7y3pkZBMJ/
5. juju destroy-model pockube
- wait until deletion is done, if it stucks, use --force
6. juju destroy-model pocapache
- I can't delete pocapache even if I use --force

I can't reproduce this everytime but I was able to reproduce after 5times tries.
controller's machine-0.log is here

https://pastebin.ubuntu.com/p/GtNSv2FThg/