Verify commits by SSH key

[shmargum]

Summary

Git 2.34 now supports signing commits with SSH keys instead of GPG
It would be nice to verify commits by SSH key, like they are with GPG keys.

Motivation

Signing with ssh key is a simpler alternative to signing with a gpg key

relevant GitHub discussion:
community/community#7744

Proposal

This can be implemented much the same way as GPG key checks are done.

[hex-m]

possible duplicate: #16007

[jannfis]

This could be rather easily integrated after we implement #14964

[olivergondza]

In scope for #25148