refactor(git): prepare support for commit signing with other key formats #29875
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Changes
I've refactored the implementation for commit signing as a preparatory step for supporting other key formats like SSH.
Context
I submitted a PR (#29550) that adds support for SSH-based commit signing which currently includes a refactoring to support multiple key formats. During review, it was suggested to do the refactoring in a separate PR (#29550 (comment)).
Once this PR has been merged, I'll update #29550 accordingly.
Documentation (please check one with an [x])
How I've tested my work (please select one)
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