fix: remove Pulumi step once SST fixes

[KevinWu098]

Describe the feature you'd like to request

      # https://github.com/anomalyco/sst/issues/6314
      - name: Setup Pulumi
        uses: pulumi/actions@v5
        with:
          pulumi-version: 3.138.0 # Any version < 3.214.0 works

This needs to be removed from the prod, staging, and destroy workflows. Was added in this commit: 57c1142?diff=split

Describe the solution you'd like to see

^

Additional information

No response