Provider Pluggability in Provision Dialogs

[agrare]

The provision dialogs are filled with calls to specific provider workflow classes such as:
keys = wf.kind_of?(ManageIQ::Providers::Redhat::InfraManager::ProvisionWorkflow) [ref
if wf.kind_of?(ManageIQ::Providers::Vmware::InfraManager::ProvisionWorkflow) [ref]
and
if wf.kind_of?(ManageIQ::Providers::Openstack::CloudManager::ProvisionWorkflow) [ref]

Ideally we should refactor these so that they ask the workflow rather than checking the type of workflow

ManageIQ/manageiq#19440

[skateman]

The same provisioning dialogs are being rendered for service templates (catalog items) on a per-provider basis, so after I convert those to react, this should be fairly easy.

related issues ManageIQ/manageiq#20603 #6944

[miq-bot]

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