[AMD][CI] Swap the AMD PR gate to ROCm 7.2 and demote ROCm 7.0 to a daily shadow (#34204)

Co-authored-by: yctseng0211 <yctseng@smci355-ccs-aus-m12-17.cs-aus.dcgpu>
Co-authored-by: Chen <bingxche@amd.com>

.github/workflows/release-branch-cut.yml

@@ -174,7 +174,7 @@ jobs:
 
   run-pr-tests-amd:
     needs: cut-release-branch
-    uses: ./.github/workflows/pr-test-amd.yml
+    uses: ./.github/workflows/pr-test-amd-rocm720.yml
     with:
       ref: ${{ needs.cut-release-branch.outputs.branch_name }}
       run_all_tests: true
@@ -213,7 +213,7 @@ jobs:
 
   run-nightly-tests-amd:
     needs: cut-release-branch
-    uses: ./.github/workflows/nightly-test-amd.yml
+    uses: ./.github/workflows/nightly-test-amd-rocm720.yml
     with:
       ref: ${{ needs.cut-release-branch.outputs.branch_name }}
     secrets: inherit