[NuGet.org Bug]: Package validation failure emails use SHA1 thumbprints not SHA256 thumbprints

[blowdart]

Impact

It's more difficult to complete my work

Describe the bug

nuget.org's certificate settings use SHA256 thumbprints in the display

However, the validation failure emails sent when a certificate has not been registered use SHA1 thumbprints

Repro Steps

1. Create and sign a new package with a certificate that is not registered to your account
2. Upload it, and wait for validation to fail because the certificate is not associated with the account
3. Check the validation failed emails

Expected Behavior

The validation failed email uses SHA256 thumbprints, not SHA1 thumbprints

Screenshots

No response

Additional Context and logs

No response

[mariaghiondea]

@ryuyu FYI for #10073

[erdembayar]

@ryuyu
Triage meeting: We assigned the issue to you since you're already working on related issue, less context switch.