[tink worker][tink server] provide ability to retry actions

[jacobweinstock]

It would be nice to provide some builtin functionality to be able to retry individual Actions in a Workflow. This would shift (at least some of) the requirement from the writers of Actions handling retries to tink worker and tink server. This is especially noticeable in our current set of Actions at github.com/tinkerbell/actions, as none of them support any type of retrying.

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