Generate FIPS-compatible ssh keys

[zaneb]

The default SSH key format in CentOS appears to have changed from RSA to ED25519, however this is not compatible with FIPS. Explicitly request an RSA key to avoid blocking FIPS installs.

[zaneb]

The default was changed in OpenSSH 9.5. OpenSSH was updated from 8.7 to 9.9 in RHEL9.8.

[zaneb]

/retest-required

[andfasano]

/lgtm

[elfosardo]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elfosardo

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[elfosardo]

/retest

[openshift-ci]

@zaneb: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-metal-ipi-virtualmedia	f5a05c3	link	false	/test e2e-metal-ipi-virtualmedia
ci/prow/e2e-metal-ipi-bm	f5a05c3	link	true	/test e2e-metal-ipi-bm

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[zaneb]

Merged this manually since (a) it's clearly fine, and (b) the world is broken.