Support pytest-odoo

[petrus-v]

uptstream PR: odoo#184409

Description of the issue/feature this PR addresses:

Allow other python test launcher than unittest back (this was introduced by this commit odoo@ccf3c1e) in odoo 18 only.

wasSuccessful function is injected by unitest launcher and not present while using pytest launcher (using pytest-odoo plugin)

Current behavior before PR:

Tests failed with following error using pytest

    def run(self, result):
        testMethod = getattr(self, self._testMethodName)
    
        if getattr(testMethod, '_retry', True) and getattr(self, '_retry', True):
            tests_run_count = self._tests_run_count
        else:
            tests_run_count = 1
            _logger.info('Auto retry disabled for %s', self)
    
        quiet_log = None
        for retry in range(tests_run_count):
            result.had_failure = False  # reset in case of retry without soft_fail
            if retry:
                _logger.runbot(f'Retrying a failed test: {self}')
            if retry < tests_run_count-1:
                with warnings.catch_warnings(), \
                        result.soft_fail(), \
                        lower_logging(25, logging.INFO) as quiet_log:
                    super().run(result)
                if not (result.had_failure or quiet_log.had_error_log):
                    break
            else:  # last try
                super().run(result)
>               if not result.wasSuccessful() and BaseCase._tests_run_count != 1:
E               AttributeError: 'TestCaseFunction' object has no attribute 'wasSuccessful'

.venv/lib/python3.12/site-packages/odoo/tests/common.py:339: AttributeError

Desired behavior after PR is merged:

no errors raised from tests/common.py

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