RHOAIENG-17256: install necessary base OS package to make Knit rendering of R markup to PDF possible

[atheo89]

Move this change on RHEL9 flavor.

Related to:
opendatahub-io#798
https://issues.redhat.com/browse/RHOAIENG-17256

[openshift-ci]

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[openshift-ci]

@atheo89: The following test 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/images	f6e1d54	link	true	/test images

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[jiridanek]

/lgtm