Remove duplicate @ prefix from issueAuthor in GitOps (#52877)

Author: akoeplinger

.github/policies/disallow-edits.yml

@@ -36,7 +36,7 @@ configuration:
         then:
           - addReply:
               reply: >-
-                  @${issueAuthor} - This PR edits a file in the .github folder, which is not allowed. CC @dotnet/docs.
+                  ${issueAuthor} - This PR edits a file in the .github folder, which is not allowed. CC @dotnet/docs.
           - closePullRequest
 
       - description: Close PRs that change Framework Design Guidelines.
@@ -51,7 +51,7 @@ configuration:
         then:
           - addReply:
               reply: >-
-                  @${issueAuthor} - This PR edits a file in the design-guidelines folder, which is disallowed. This content is reprinted by permission of Pearson Education, Inc. from Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries, 2nd Edition, and cannot be edited. CC @dotnet/docs.
+                  ${issueAuthor} - This PR edits a file in the design-guidelines folder, which is disallowed. This content is reprinted by permission of Pearson Education, Inc. from Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries, 2nd Edition, and cannot be edited. CC @dotnet/docs.
           - if:
               - or:
                   - activitySenderHasPermission: