Remove single remaining threading test

.github/workflows/main.yml

@@ -155,39 +155,6 @@ jobs:
           --artifacts target/artifacts \
           --rust-wit-bindgen-path ./crates/guest-rust
 
-  # While threading is off-by-default and toolchains are percolating this is a
-  # separate job to get configured slightly differently.
-  threading:
-    name: Test WASIp3 Threading (allowed to fail)
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-      with:
-        submodules: true
-
-    - name: Install Rust
-      run: rustup update stable --no-self-update && rustup default stable
-    - run: rustup target add wasm32-wasip2
-
-    - uses: ./.github/actions/install-wasi-sdk
-
-    # The threading builtins are encoded with a canonical-function opcode
-    # newer than any released wasmtime understands (46.0.1 and 47.0.2 both
-    # reject it with "invalid leading byte (0x2d) for canonical function"),
-    # so this job runs wasmtime's `dev` build instead of the pinned release.
-    # This can go back to the shared pin once a release parses the encoding.
-    - name: Install wasmtime dev build
-      run: |
-        curl --retry 5 --retry-all-errors -L -o wasmtime-dev.tar.xz https://github.com/bytecodealliance/wasmtime/releases/download/dev/wasmtime-dev-x86_64-linux.tar.xz
-        tar xJf wasmtime-dev.tar.xz
-        echo "`pwd`/wasmtime-dev-x86_64-linux" >> $GITHUB_PATH
-      working-directory: ${{ runner.temp }}
-
-    - run: |
-        cargo run test --languages rust,c,go tests/threading \
-          --artifacts target/artifacts \
-          --rust-wit-bindgen-path ./crates/guest-rust
-
   test_unit:
     name: Crate Unit Tests
     runs-on: ubuntu-latest