Add MODULE.bazel

Test Python dependencies now use rules_python
Update deps

PiperOrigin-RevId: 609605937

scripts/build_and_run_tests_bazel.sh

 #!/bin/bash
 
-# The following scripts:
-# - updates the frozen dependencies
-# - builds and runs tests
+# The following script builds and runs tests
 
 set -e  # exit when any command fails
 set -x  # Prints all executed commands
@@ -21,12 +19,7 @@ fi
 
 echo "Building and testing in $PWD using 'python' (version $PYVERSION)."
 
-export PYTHON_BIN_PATH=`which python3`
-export PYTHON_LIB_PATH=`python3 -c "import sysconfig; print(sysconfig.get_path('include'))"`
-echo "Using PYTHON_BIN_PATH: $PYTHON_BIN_PATH"
-echo "Using PYTHON_LIB_PATH: $PYTHON_LIB_PATH"
-
-bazel clean --expunge
+bazel clean --expunge # Force a dep update
 
 BAZEL_CXXOPTS="-std=c++17" bazel test ... --test_output=errors "$@" --enable_bzlmod
 BAZEL_CXXOPTS="-std=c++20" bazel test ... --test_output=errors "$@" --enable_bzlmod