Merged PR 50758: [release/9.0] Updated PCA of DAC cert

#### AI description  (iteration 1)
#### PR Classification
Pipeline configuration update adjusting certificate validation.

#### PR Summary
This pull request updates the expected issuer for the DAC signing certificate in the diagnostic file signing pipeline to reflect the new PCA 2024 certificate.
- `eng/pipelines/coreclr/templates/sign-diagnostic-files.yml`: Changed the certificate issuer string from "Microsoft Code Signing PCA 2010" to "Microsoft Code Signing PCA 2024".
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Author: hoyosjs

eng/pipelines/coreclr/templates/sign-diagnostic-files.yml

@@ -69,7 +69,7 @@ steps:
         }
 
         if ($signingCert.Subject -ne "CN=.NET DAC, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" `
-            -or $signingCert.Issuer -ne "CN=Microsoft Code Signing PCA 2010, O=Microsoft Corporation, L=Redmond, S=Washington, C=US")
+            -or $signingCert.Issuer -ne "CN=Microsoft Code Signing PCA 2024, O=Microsoft Corporation, L=Redmond, S=Washington, C=US")
         {
           throw "File $file not in expected trust chain."
         }