Update kn image from client-kn-rhel8 to kn-client-kn-rhel8

[savitaashture]

Changes

kn images are published to kn-client-kn-rhel8 instead client-kn-rhel8

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Release Notes

[jkhelil]

/approve
/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jkhelil

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[savitaashture]

/cherry-pick main

[tekton-robot]

@savitaashture: #2620 failed to apply on top of branch "main":

Applying: Update kn image from client-kn-rhel8 to kn-client-kn-rhel8
Using index info to reconstruct a base tree...
M	config/openshift/base/operator.yaml
M	operatorhub/openshift/release-artifacts/bundle/manifests/openshift-pipelines-operator-rh.clusterserviceversion.yaml
Falling back to patching base and 3-way merge...
Auto-merging operatorhub/openshift/release-artifacts/bundle/manifests/openshift-pipelines-operator-rh.clusterserviceversion.yaml
CONFLICT (content): Merge conflict in operatorhub/openshift/release-artifacts/bundle/manifests/openshift-pipelines-operator-rh.clusterserviceversion.yaml
Auto-merging config/openshift/base/operator.yaml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Update kn image from client-kn-rhel8 to kn-client-kn-rhel8
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick main

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