Add support the display of duplicate tag names (fix #832)

[sharovd]

Context

• Fix the issue Allure report's tags support the display of duplicate tag names #832
• All user-defined markers (e.g. case_id) will be fully collected according to the described problem
• Only the closest built-in pytest markers (e.g. skipif) will still be collected according to the existing tests
• Modified pytest_markers() method and corresponding test test_show_reserved_pytest_markers_full_decorator()

Checklist

• Sign Allure CLA
• Provide unit tests

P.S.: This is my first open source contribution. I'm happy to improve it if there's anything that needs to be changed or improved. Thanks for reviewing!

[delatrie]

Hi, @sharovd

Thank you for investing your time in allure-pytest.

The thing is that allure-pytest is unique among other Allure integrations in that it tries to convert to tags something that doesn't really fit into the idea of tags: pytest markers with arguments. I believe implementing this was a mistake, as it creates more problems than it solves. We shouldn't also convert built-in markers, as we have better options to indicate their effect. I've described it in more detail in the issue.

And if we don't convert the abovementioned markers, the problem with missing tags will resolve itself (multiple markers with no arguments means the tag values will be the same, and there is no point in having multiple tags with absolutely the same values).

We have an existing issue that addresses just that: #817, and we should implement it. If you're still willing to work on markers-to-tags conversion, you may take the implementation from allure-pytest-bdd and adjust the tests accordingly.