remove emojis from update-release-manifest PR body (#508)

remove emojis from update-release-manifest and rollback-release-manifest PR body

Co-authored-by: Deep Furiya <dfuriya@amazon.com>

Author: deepfuriya

.github/workflows/rollback-release-manifest.yml

@@ -58,6 +58,6 @@ jobs:
 
             Triggered manually by @${{ github.actor }}.
 
-            > ℹ️ To trigger validation, close and reopen this PR.
+            > ️To trigger validation, close and reopen this PR.
           labels: release-manifest, automated, rollback
           add-paths: assets/release-manifest.json

.github/workflows/update-release-manifest.yml

@@ -63,7 +63,7 @@ jobs:
             This PR was created by the `update-release-manifest` workflow.
             Please review the manifest changes and approve.
 
-            > ⚠️ This file is protected — only automated PRs from this workflow are allowed to modify `assets/release-manifest.json`.
-            > ℹ️ To trigger validation, close and reopen this PR.
+            > This file is protected — only automated PRs from this workflow are allowed to modify `assets/release-manifest.json`.
+            > To trigger validation, close and reopen this PR.
           labels: release-manifest, automated
           add-paths: assets/release-manifest.json