ci: Regenerate and verify the supported message file

in order to enforce congruence between it and its source list.

Furthermore drop the generated file from rustfmt ignore
as it's apparently currently formatted.

.github/workflows/ci_verify_clean_supported_message.yml

@@ -0,0 +1,19 @@
+name: CI verify cleanly generated supported message
+'on':
+  workflow_call: null
+jobs:
+  supported_message:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout (GitHub)
+        uses: actions/checkout@v4
+      - name: Install dependencies
+        run: npm install
+        working-directory: tools/schema/
+      - name: Regenerate supported message
+        run: node gen_supported_message
+        working-directory: tools/schema/
+      - name: Format generated code
+        run: rustfmt lib/src/core/supported_message.rs
+      - name: Verify generated code matches committed code
+        run: git status --porcelain

.github/workflows/main.yml

@@ -33,3 +33,6 @@ jobs:
         run: cargo build --features test-vendored-openssl
       - name: Run tests
         run: cargo test --features test-vendored-openssl --verbose
+
+  verify-clean-supported-message:
+    uses: ./.github/workflows/ci_verify_clean_supported_message.yml

rustfmt.toml

@@ -1,5 +1,4 @@
 ignore = [
-    "core/src/supported_messsages.rs",
     "server/src/address_space/generated",
     "types/src/node_ids.rs",
     "types/src/service_types",