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/kind feature

Ok, this is ready for review/discussion.

I was unsure how the implementation should look for the strategic merge json patch mentioned in https://github.com/shipwright-io/community/blob/main/ships/0039-build-scheduler-opts.md#tolerations

This currently works and patches the BuildRun/Build object:

kubectl patch BuildRun <buildrun-name> --type=merge -p '{"spec":{"tolerations":[{"key":"test-key-patch","operator":"Equal","value":"test-value-patch"}]}}' -n test-ns

But didn't know if that was all that was required or what that should ideally look like.

Also looking for input on what implementing the subset of tolerations functionality should ideally look like, or if the current implementation is ok (failing validation if unsupported fields are specified/ always setting "NoSchedule").

I've also left the validaitons on the Shipwright end to enforce the simpler requirements here, and let Kubernetes do the rest of the toleration validation with the full ruleset.