Validate MODULE.bazel version equals module directory version (#3059)

@meteorcloudy / @Wyverald this adds a check to avoid what happened in
#3025 and which was resolved in #3047.

The `module#version` within the `MODULE.bazel` is validated to be what
the module directory has.

tools/bcr_validation.py

@@ -28,6 +28,7 @@
 """
 
 import argparse
+import ast
 import json
 import subprocess
 from pathlib import Path
@@ -337,6 +338,17 @@ def verify_module_dot_bazel(self, module_name, version):
         else:
             self.report(BcrValidationResult.GOOD, "Checked in MODULE.bazel matches the sources.")
 
+        tree = ast.parse("".join(bcr_module_dot_bazel_content), filename=source_root)
+        for node in tree.body:
+            if isinstance(node, ast.Expr):
+                if isinstance(node.value, ast.Call) and node.value.func.id == "module":
+                    keywords = {k.arg: k.value.value for k in node.value.keywords if isinstance(k.value, ast.Constant)}
+                    if keywords.get("version", version) != version:
+                        self.report(
+                            BcrValidationResult.FAILED,
+                            "Checked in MODULE.bazel version does not match the version of the module directory added.",
+                        )
+
         shutil.rmtree(tmp_dir)
 
     def check_if_bazel_version_is_set(self, tasks):