allow deletion of VMs in infra manager

[dberg1]

It is currently not possible to delete a VM with infra provider.
This would be useful for HMC provider, see ManageIQ/manageiq-providers-ibm_power_hmc#127.
This PR adds the following menu item:

[jeffibm]

Hey @dberg1,

For testing, I tried loading the ui-classic, ibm-power-hmc, manageiq repo Pr's and got this error -

role_allows? no feature was found with identifier: ["vm_terminate"]. Correct the identifier or add it to miq_product_features.yml. [vm_infra/explorer]

Guess it's because the ibm-power-hmc repo is WIP.

The rest of the code looks good in classic. Let us know when it's ready to be merged.

[dberg1]

@jeffibm You also need this PR: ManageIQ/manageiq#22257

[miq-bot]

Checked commits https://github.com/dberg1/manageiq-ui-classic/compare/153382429c5769705fe712f69c96d2cac22f9419~...1a9f8fbd22fe84105d62801b40ea23c2d0bbb0dd with ruby 2.6.10, rubocop 1.28.2, haml-lint 0.35.0, and yamllint
3 files checked, 2 offenses detected

app/helpers/application_helper/toolbar/vm_infras_center.rb

• ❗ - Line 303, Col 32 - Layout/MultilineMethodCallBraceLayout - Closing method call brace must be on the line after the last argument when opening brace is on a separate line from the first argument.

app/helpers/application_helper/toolbar/x_vm_center.rb

• ❗ - Line 263, Col 47 - Layout/MultilineMethodCallBraceLayout - Closing method call brace must be on the line after the last argument when opening brace is on a separate line from the first argument.