Consider PVC access mode in affinity assistant

[lbernick]

This improvement was requested in #6543. PVCs that have access mode "ReadWriteOnce" can't be accessed in parallel from pods running on different nodes, and in these cases it is appropriate to use the affinity assistant to schedule them to the same node. However, if a cluster operator allows usage of "ReadWriteMany" and "ReadOnlyMany" PVCs as well, these can be accessed from different nodes, and it's not necessary to use the affinity assistant. We should consider updating the coscheduling options "workspaces" and "pipelineruns" to take into account PVC access mode, to provide more optionality for clusters where both "ReadWriteOnce" and "ReadWriteMany" access modes are used.

[tekton-robot]

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[vdemeester]

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