Add option for DNS SAN based on SA name

[SgtCoDFish]

Creating this on @jsalowey 's behalf since he's having permission errors. Hopefully this should get us unblocked and able to start discussing the actual PR.

To be clear: this is Joe's work, not mine!

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• 85eeda9 Add option for DNS SAN based on SA name

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[cert-manager-prow]

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