Disable API breakage check in pull request workflow (#1217)

Author: ktoso

.github/workflows/pull_request.yml

@@ -9,6 +9,7 @@ jobs:
  name: Soundness
  uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
  with:
+ api_breakage_check_enabled: false
  license_header_check_project_name: "Swift Distributed Actors"
 
  unit-tests: