Disable Wasm test

Author: gwynne

.github/workflows/test.yml

@@ -191,6 +191,8 @@ jobs:
         run: swift build --swift-sdk x86_64-swift-linux-musl
 
   wasm:
+    # Wasm support isn't quite there yet, disable for now.
+    if: false
     permissions:
       contents: read
     runs-on: ubuntu-latest