Remove default inputs from the workflow file

Author: shahmishal

.github/workflows/pull_request.yml

@@ -12,11 +12,6 @@ jobs:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
     with:
-      api_breakage_check_enabled: true
-      broken_symlink_check_enabled: true
-      docs_check_enabled: true
       format_check_enabled: false
       license_header_check_enabled: false
       license_header_check_project_name: "Swift.org"
-      shell_check_enabled: true
-      unacceptable_language_check_enabled: true