[PyCDE] Remove behavioral if-else-end construct

Python 3.13 broke this functionality. We were never happy with the
syntax so rather than fixing it, I'm just removing it. If anyone was
using it (we're not using it internally), reach out to me to discuss
better ways of doing this.

Author: teqdruid

.github/workflows/pycdePublish.yml

@@ -33,6 +33,11 @@ jobs:
           - cp312-manylinux_x86_64
           - cp313-manylinux_x86_64
     steps:
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
       - name: Get CIRCT (no submodules)
         uses: actions/checkout@v4
         with:
@@ -107,6 +112,11 @@ jobs:
           - cp312-win_amd64
           - cp313-win_amd64
     steps:
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
       # Since we don't use docker on Windows, we need to install the dependencies.
       - name: Build additional c++ deps
         shell: pwsh

frontends/PyCDE/src/CMakeLists.txt

@@ -26,7 +26,6 @@ declare_mlir_python_sources(PyCDESources
   pycde/dialects/hwarith.py
   pycde/support.py
   pycde/module.py
-  pycde/behavioral.py
   pycde/constructs.py
   pycde/common.py
   pycde/system.py