CLOUDP-313350: Fix the commit sign base64 encoding

[josvazg]

Summary

Must use base64 -w0 to avoid new lines in commits with long changes. before that, the base64 encoding adding EOLs to the encoded output was breaking requests sent to GitHub.

Also fixed some formatting whitespacing and EOLs.

Proof of Work

✅ Test commit generated in test repo Commit generating test job

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
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• Have you checked for release_note changes?
• Have you signed our CLA?

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[josvazg]

cc @roothorp this is the actual fix, all the rest are formatting fixes