feat(helm): add secretTemplate-ing to certificate

[guntiskarulis]

Pull Request Motivation Some environments have admission webhooks that might mandate specific labels or annotations. This change allows chart users to set labels and/or annotations in the Secret created by the Certificate resources.

Close https://github.com/cert-manager/trust-manager/issues/453

[cert-manager-prow[bot]]

Hi @guntiskarulis. Thanks for your PR.

I'm waiting for a cert-manager member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[erikgb]

/ok-to-test

[erikgb]

/approve

Thanks @guntiskarulis! If you make CI happy, I will allow this to merge. Are you able to squash commits into a single one before we merge?

[cert-manager-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: erikgb

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/cert-manager/trust-manager/blob/main/OWNERS)~~ [erikgb] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[erikgb]

Thanks @guntiskarulis! 🚀

/lgtm