Fix runtime issues with Python 3.13

Fixed config_parser.py: MySQLRawConfigParser extends Python's
RawConfigParser, and overwrites one of its methods. This class was
rewritten in Python 3.13, and some of the internal implementation has
changed.

Fixed Json_shell.incomplete_python, Python 3.13 has changed how errors
are printed, they used to be printed in chunks, now the whole lines are
printed.

Change-Id: Id1ddefa61260ac3453988ea041b125e3c6d50ee5

Author: Paweł Andruszkiewicz

python/packages/mysql_gadgets/common/config_parser.py

@@ -367,8 +367,8 @@ def _read(self, fp, fpname):
                     # Use dict comprehension syntax compatible with Python 2.6:
                     # inline_prefixes = {p: -1 for p in
                     #                    self._inline_comment_prefixes}
-                    inline_prefixes = dict(
-                        (p, -1) for p in self._inline_comment_prefixes)
+                    inline_prefixes = self._inline_comment_prefixes if hasattr(self, '_inline_comment_prefixes') else self._prefixes.inline
+                    inline_prefixes = dict((p, -1) for p in inline_prefixes)
                     while comment_start == sys.maxsize and inline_prefixes:
                         next_prefixes = {}
                         for prefix, index in inline_prefixes.items():
@@ -381,7 +381,8 @@ def _read(self, fp, fpname):
                                 comment_start = min(comment_start, index)
                         inline_prefixes = next_prefixes
                     # strip full line comments
-                    for prefix in self._comment_prefixes:
+                    comment_prefixes = self._comment_prefixes if hasattr(self, '_comment_prefixes') else self._prefixes.full
+                    for prefix in comment_prefixes:
                         if line.strip().startswith(prefix):
                             comment_start = 0
                             break

unittest/json_shell_t.cc

@@ -220,14 +220,14 @@ def sample(data):
 
 sample("some text"
 )*",
-       "{\"error\":\"SyntaxError\"}"},
+       "{\"error\":\"SyntaxError"},
       {R"*(
 def sample(data):
   print(data)
 
 sample("some text)
 )*",
-       "\"error\":\"SyntaxError\"}"}};
+       "\"error\":\"SyntaxError"}};
 
   for (const auto &input : invalid_inputs) {
     shcore::JSON_dumper doc;