Make aarch64 boot asset download optional with graceful fallback <JIRA: OSPRH-32103>

[mumesan]

Description:
The extract-boot-assets.sh script runs and fails when aarch64 packages are not found in x86_64 repositories. This PR makes the download section graceful, there is a check for whether the dnf download errors out and prints a warning log if so. The aarch64 directories are only created when the dnf download succeeds so that the pxe-init.sh script in ironic-operator does not run into issues when it looks for those subdirectories and they are not found.

Jira Link: OSPRH-32103

[centosinfra-prod-github-app]

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://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/0f040bdf3bc546dc8bbc82b823ecef6f

✔️ openstack-meta-content-provider SUCCESS in 2h 19m 13s
❌ tcib-crc-podified-edpm-baremetal RETRY_LIMIT in 41m 46s
✔️ tcib-podified-multinode-edpm-deployment-crc SUCCESS in 1h 28m 22s

[mumesan]

recheck

[centosinfra-prod-github-app]

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://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/89acb9ee8dd945afaa5ad3144258eb5f

✔️ openstack-meta-content-provider SUCCESS in 2h 26m 03s
❌ tcib-crc-podified-edpm-baremetal NODE_FAILURE Node(set) request 099-0000136355 failed in 0s
✔️ tcib-podified-multinode-edpm-deployment-crc SUCCESS in 1h 31m 07s

[juliakreger]

LGTM, thanks!

[openshift-ci]

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[lhh]

This looks good to me. Thanks.