Enable installing wntp to tempest-all

[averdagu]

A new variable is defined called tcib_tempest_enable_wntp that if set to true will also install WNTP to tempest-all container image.

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Skipping CI for Draft Pull Request.
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[openshift-ci]

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/c523135c3e824ae8b596b84b3ce89d88

❌ openstack-meta-content-provider FAILURE in 10m 55s
⚠️ tcib-crc-podified-edpm-baremetal SKIPPED Skipped due to failed job openstack-meta-content-provider
⚠️ tcib-podified-multinode-edpm-deployment-crc SKIPPED Skipped due to failed job openstack-meta-content-provider