Closes #18658: Add start on boot field to VirtualMachine model

[RobertH1993]

Closes: #18658

Adds start on boot field to VirtualMachine model

[RobertH1993]

For reviewers

I had doubts about how I would do the displaying of the start on boot status. The 'status' field in the model VirtualMachine uses a badge. I decided to not use a badge but plaintext or a placeholder when the 'start_on_boot' field is empty. This was a personal choice but can be changed ofc. I did specify colors in the choices model for when a badge is preferred.

I took inspiration from another merge request that added a status field to some model, so I guess I got everything covered, bulk_imports, csv_imports, etc. I added this to the tests too and they run succesfully.

[arthanson]

Good work, just some cleanup needed mostly on the color and merge the migrations together.

[arthanson]

These migrations should be collapsed together

[RobertH1993]

I removed this migration, like you said in another feedback item there isn't really a case where the field should be empty. There is always some kind of behaviour when the hypervisor reboots

[arthanson]

Thanks @RobertH1993 !