✨ Inject Ironic CA Cert in IPA

[diconico07]

What this PR does / why we need it:

This PR adds a way to inject the Ironic CA as well as additional CA certificates into the IPA image, it allows removing the ipa-insecure flag and actually validate the Ironic certificate from the IPA.

This solution should work for both virtualmedia and PXE based deployments.

Checklist:

• Documentation has been updated, if necessary.
• Integration tests have been added, if necessary.

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[diconico07]

Putting as draft for now, as I didn't get time to test it works as expected in all situations (in particular I'll try to setup a PXE environment to test it works with PXE).
This is not the solution we currently use at SUSE to get rid of the ipa-insecure flag (we do the injection in the ipa downloader), but this one should be more future-proof as we can get IPA images that are not coming from the ipa downloader.