[CI] Add soundness check

Author: shahmishal

.github/workflows/pull_request.yml

@@ -8,3 +8,14 @@ jobs:
   tests:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+  soundness:
+        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: true
+            license_header_check_enabled: false
+            shell_check_enabled: true
+            unacceptable_language_check_enabled: true