[Guido's Gorgeous Lasagna] Fixed bug with lasagna ImportError message extraction.

[BethanyG]

Adjusted the following code, starting on line 140:

    def pytest_exception_interact(self, node, call, report):
        """
        Catch the last exception handled in case the test run itself errors.
        """
        if report.outcome == "failed":
            excinfo = call.excinfo
            err = excinfo.getrepr(style="no", abspath=False)

            # trim off full traceback for first exercise to be friendlier and clearer
            if 'lasagna' in node.name and 'ImportError' in str(err.chain[0]):
                trace = err.chain[-2][0]
            else:
                trace = err.chain[-1][0]

            crash = err.chain[0][1]
            self.last_err = self._make_message(trace, crash)

previously, lasagna was capitalized, causing the code that strips the stack trace to fail. This has been fixed. Before, the student would see this for an import error in the UI:

ImportError while importing test module '.mnt.exercism-iteration.lasagna_test.py'.
Hint: make sure your test modules.packages have valid Python names.
Traceback:
.mnt.exercism-iteration.lasagna_test.py:6: in <module>
    from lasagna import (EXPECTED_BAKE_TIME,
E   ImportError: cannot import name 'bake_time_remaining' from 'lasagna' (.mnt.exercism-iteration.lasagna.py)

During handling of the above exception, another exception occurred:
.usr.local.lib.python3.10.importlib.__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
.mnt.exercism-iteration.lasagna_test.py:23: in <module>
    raise ImportError("In your 'lasagna.py' file, we can not find or import the"
E   ImportError: MISSING CONSTANT --> We can not find or import the constant EXPECTED_BAKE_TIME in your 'lasagna.py' file.  Did you mis-name or forget to define it?

Now they will see the following in the UI (once the test file changes in the content repo are merged):

ImportError: 
   
   MISSING CONSTANT --> 
   We can not find or import the constant 'EXPECTED_BAKE_TIME' in your 'lasagna.py' file.
   Did you mis-name or forget to define it?

[ErikSchierboom]

Nice! It might be worth adding a test case for this: https://github.com/exercism/python-test-runner/tree/main/test

[BethanyG]

@ErikSchierboom -- good point! I added two: one for the constant, and one for a function name. 😄