refactor: set NestedHVEnabled only when requested or true

[tenthirtyam]

Description

Adds a conditional check when setting the nested virtualization flag, which helps avoid unnecessary configuration when the feature is not enabled.

Documentation updates:

• Removed the default value note ("Defaults to false.") for the NestedHV option from the documentation in both .web-docs/components/builder/vsphere-clone/README.md and .web-docs/components/builder/vsphere-iso/README.md to keep the documentation concise and avoid redundancy. [1] [2]
• Removed the same default value note from the struct definition in builder/vsphere/common/step_hardware.go.
• Updated the Configure method in builder/vsphere/driver/vm.go to only set NestedHVEnabled in the VM configuration when NestedHV is true, preventing unnecessary configuration when nested virtualization is not requested.

Resolved Issues

Rollback Plan

Revert commit.

Changes to Security Controls

None.

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