Update MSVC bytecode workflow to use only 1 part

Author: jmid

.github/workflows/msvc-530-trunk-bytecode.yml

@@ -8,17 +8,7 @@ on:
   workflow_dispatch:
 
 jobs:
-  part1:
+  build:
     uses: ./.github/workflows/msvc-common.yml
     with:
       bytecodeonly: true
-      dune_alias: 'ci1'
-
-  part2:
-    needs: part1
-    # Run part2 even if some test failed in part1:
-    if: ${{ always() }}
-    uses: ./.github/workflows/msvc-common.yml
-    with:
-      bytecodeonly: true
-      dune_alias: 'ci2'