chore: update the default OS in example

[Aashiq-J]

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[Aashiq-J]

/run pipeline

[vkuma17]

@Aashiq-J i think this pipeline will fail because for monitoring agent will not get installed on cluster with RHCOS nodes. I have another PR opened #640 which takes care of this change.

[vkuma17]

With default OCP version change, 4.18 OCP is the default and hence we have to move to RHCOS. But monitoring agent has some issue fetching the libraries on RHCOS which is natively supported for RHEL 8. To overcome this issue, we can enable universal ebpf for the monitoring agent helm chart but in this module we are having old monitoring agent helm chart which does not support ebpf also. Hence, we have to lock in the old version of OCP to unblock test failures which is taken care in
#641. This PR is closed without being merged.