chore: test and example tech debt

[tenthirtyam]

Summary

Updates the tests and examples from the the original JetBrains content to generalized example content.

Testing

➜ make test
?       github.com/hashicorp/packer-plugin-vsphere      [no test files]
ok      github.com/hashicorp/packer-plugin-vsphere/builder/vsphere/clone        1.557s
ok      github.com/hashicorp/packer-plugin-vsphere/builder/vsphere/common       2.338s
ok      github.com/hashicorp/packer-plugin-vsphere/builder/vsphere/driver       5.569s
ok      github.com/hashicorp/packer-plugin-vsphere/builder/vsphere/iso  1.557s
ok      github.com/hashicorp/packer-plugin-vsphere/builder/vsphere/supervisor   4.876s
?       github.com/hashicorp/packer-plugin-vsphere/examples/driver      [no test files]
ok      github.com/hashicorp/packer-plugin-vsphere/post-processor/vsphere       1.399s
ok      github.com/hashicorp/packer-plugin-vsphere/post-processor/vsphere-template      1.527s