add condition for ipxe_tls template usage

[Rozzii]

Previously custom ironic ipxe template was taken into use in ironic config even when the TLS support was not enabled for the ironic-image.

This commit:

• Adds a condition to exclude/include referencing custom ipxe template based on whether TLS is enabled for the ipxe.

[Rozzii]

/cc @lentzi90 @dtantsur @elfosardo

[Rozzii]

/test-centos-integration-main /test-ubuntu-integration-main

[elfosardo]

/approve

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elfosardo

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/metal3-io/ironic-image/blob/main/OWNERS)~~ [elfosardo] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[Rozzii]

/test-centos-integration-main /test-ubuntu-integration-main

[Rozzii]

/test-centos-integration-main

[Rozzii]

/override test-ubuntu-integration-main ubuntu test was expected to fail because of the CI issue that this PR might be able to fix but not until it is merged.

[metal3-io-bot]

@Rozzii: Overrode contexts on behalf of Rozzii: test-ubuntu-integration-main

In response to [this](https://github.com/metal3-io/ironic-image/pull/463#issuecomment-1860142227): >/override test-ubuntu-integration-main >ubuntu test was expected to fail because of the CI issue that this PR might be able to fix but not until it is merged. Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.