Make link to issue template url safe (#3508)

## Changes
Make link to issue template url safe using Python's urllib

### Linked issues

Introduced in #3498

- [x] Manually tested

Author: JCZuurmond

src/databricks/labs/ucx/source_code/python/python_ast.py

@@ -1,10 +1,11 @@
 from __future__ import annotations
 
 import builtins
-import sys
-from abc import ABC, abstractmethod
 import logging
+import sys
 import re
+import urllib.parse
+from abc import ABC, abstractmethod
 from collections.abc import Iterable
 from dataclasses import dataclass
 from typing import TypeVar, cast
@@ -99,7 +100,7 @@ def _definitely_failure(source_code: str, e: Exception) -> MaybeTree:
             "https://github.com/databrickslabs/ucx/issues/new?title=[BUG]:+Python+parse+error"
             "&labels=migrate/code,needs-triage,bug"
             "&body=%23+Current+behaviour%0A%0ACannot+parse+the+following+Python+code"
-            f"%0A%0A%60%60%60+python%0A{source_code}%0A%60%60%60"
+            f"%0A%0A%60%60%60+python%0A{urllib.parse.quote_plus(source_code)}%0A%60%60%60"
         )
         return MaybeTree(
             None,