Fix SMIME signature for emails on push
What does this MR do and why?
Fixes a bug where an email sent to multiple recipients is signed multiple times when SMIME signing is enabled.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #215152 (closed)
Edited by Heinrich Lee Yu