Increase PR workflow duration to 3 hrs (#6883)

* Increase PR workflow duration to 2.5 hrs

* Increase PR workflow duration to 3 hrs

* Add merge_group to pr build workflow

Author: davidh44

.github/workflows/pull-request-build.yml

@@ -1,6 +1,7 @@
 name: Build SDK
 on:
   pull_request:
+  merge_group:
     types: [opened, synchronize, ready_for_review]
 
 concurrency:
@@ -27,7 +28,7 @@ jobs:
           role-to-assume: ${{secrets.PR_WORKFLOW_IAM_ROLE_ARN}}
           role-session-name: PullRequestBuildGitHubAction
           aws-region: us-west-2
-          role-duration-seconds: 7200 # 2 hours
+          role-duration-seconds: 10800 # 3 hrs
       - name: Download Build Script
         run: |
           aws s3 cp s3://aws-sdk-builds-github-assets-prod-us-west-2/$SCRIPT_LOCATION ./$DOWNLOAD_FOLDER/$SCRIPT_LOCATION --no-progress