fix: don't count stats for parent flags, even in get_variant

[thomasheartman]

Description

This PR fixes an issue where parent flags would have metrics counted when you call get_variant on a child flag. This was due to a missing skip_stats argument in the get_variant method of a feature.

I have added a test and the specific data setup that was reported to cause the issue.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• Unit tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[coveralls]

coverage: 96.905%. remained the same
when pulling 605b00e on fix/double-counting-parent-features
into 37c7df4 on main.

[gardleopard]

Great with tests on this!