Remove duplicate @ prefix from issueAuthor in GitOps (#2491)

* Remove duplicate @ prefix from issueAuthor in GitOps

https://github.com/GitOps-microsoft/GitOps.PullRequestIssueManagement/pull/262 (internal Microsoft link) changed the `${issueAuthor}` placeholder to include the `@` character.

Remove the one we added so we don't duplicate it.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update .github/policies/resourceManagement.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Raf (Raffaele Rialdi) <raffaeler@vevy.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 4 people

.github/policies/resourceManagement.yml

@@ -24,7 +24,7 @@ configuration:
       actions:
       - closeIssue
       - addReply:
-          reply: Hello @${issueAuthor}, the reviewers on this PR have requested changes and there has not been any activity for **14 days**, so it will be closed for housekeeping pourposes. Feel free to reopen or send a new one if you wish to resume the progress.
+          reply: Hello ${issueAuthor}, the reviewers on this PR have requested changes and there has not been any activity for **14 days**, so it will be closed for housekeeping purposes. Feel free to reopen or send a new one if you wish to resume the progress.
     - description: Add no recent activity label to pull requests
       frequencies:
       - hourly: