Fix incorrect tag resolution in _get_class_flags with diamond inheritance

[WHOIM1205]

Fix incorrect tag/config resolution in diamond inheritance

Summary

_FlagManager._get_class_flags currently uses hasattr and getattr when iterating over the class MRO.
Because getattr follows Python's full attribute lookup chain, classes that do not define _tags (or _config) themselves may still return values inherited from ancestors.

In diamond inheritance scenarios this can re-apply ancestor flags later in the merge order and overwrite overrides coming from mixins.

Example

class A(BaseObject):
    _tags = {"handles_missing_data": False}

class MissingDataMixin(A):
    _tags = {"handles_missing_data": True}

class MyBase(A):
    pass

class Concrete(MyBase, MissingDataMixin):
    _tags = {"custom_flag": True}

Concrete().get_tag("handles_missing_data")

[fkiraly]

Good catch. I assume an AI caught this.

Can you please make sure to:

• remove the AI generated comment and leave the old comment there
• fix the issue title

[WHOIM1205]

Good catch. I assume an AI caught this.

Can you please make sure to:

* remove the AI generated comment and leave the old comment there

* fix the issue title

thanks for the feedback
i removed the ai style comment from the fix and updated the issue title. please let me know if anything else should be adjusted.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.48%. Comparing base (306958d) to head (e568cc7).
⚠️ Report is 186 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #511      +/-   ##
==========================================
- Coverage   85.07%   83.48%   -1.60%     
==========================================
  Files          45       52       +7     
  Lines        3015     3905     +890     
==========================================
+ Hits         2565     3260     +695     
- Misses        450      645     +195     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[WHOIM1205]

@fkiraly is there anything i can change