Fix TOML boolean false values for store_true options

[marwinsteiner]

Summary

• Fix store_true config options (like exit-zero) in TOML files not respecting false values
• When exit-zero = false is set in TOML, pylint previously treated it the same as exit-zero = true because argparse store_true actions activate from flag presence alone, ignoring the trailing "False" string value
• Add _fix_store_true_options to _ConfigurationFileParser that introspects the linter's argparse actions to correctly handle boolean values for store_true options only (not yn-type options like --reports)

How it works

After _RawConfParser converts TOML values to ["--flag", "True"/"False"] string pairs, _fix_store_true_options checks each option against the linter's registered _StoreTrueAction actions:

• True values: emit just the flag (--exit-zero) without the trailing value string
• False values: omit the flag entirely so argparse uses its default

This distinction is important because other boolean-like options (e.g. --reports) use argparse's yn type and do expect a value argument.

Test plan

• Added functional test for exit-zero = false in TOML (verifies exit_zero is false)
• Added functional test for exit-zero = true in TOML (verifies exit_zero is true)
• All 32 existing functional config loading tests pass without regression

Closes #8460

[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.15%. Comparing base (0d77e90) to head (733f62b).
⚠️ Report is 73 commits behind head on main.

Files with missing lines	Patch %	Lines
pylint/config/config_file_parser.py	86.95%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10903      +/-   ##
==========================================
+ Coverage   96.04%   96.15%   +0.11%     
==========================================
  Files         177      178       +1     
  Lines       19628    19641      +13     
==========================================
+ Hits        18851    18886      +35     
+ Misses        777      755      -22     

Files with missing lines	Coverage Δ
pylint/config/config_file_parser.py	96.73% <86.95%> (-3.27%)	⬇️

... and 8 files with indirect coverage changes

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[marwinsteiner]

One CI failure, but it looks like a false positive to me:

************* Module pylint.config.config_file_parser
Notice: Wrong spelling of a word 'linter's' in a comment:
# Build a set of store_true option names from the linter's arg parser
                                                  ^^^^^^^^
Did you mean: ''liner's' or 'liter's''?
Notice: Wrong spelling of a word 'natively' in a docstring:
        TOML files can express boolean values natively (true/false). When these
                                              ^^^^^^^^
Did you mean: ''naively' or 'negatively''?
Notice: Consider using set for membership test

[DanielNoord]

Why not do this in parse_toml_file?

[DanielNoord]

You can add it to our spelling dictionary in the root of the repository

[marwinsteiner]

You can add it to our spelling dictionary in the root of the repository

Done. Moved the logic into parse_toml_file and added the spelling words. Thanks for the review!

[github-actions]

🤖 According to the primer, this change has no effect on the checked open source code. 🤖🎉

This comment was generated for commit 733f62b

[DanielNoord]

Why is this optional?

[DanielNoord]

There is a lot of duplication. Have you explored if we can do this in _parse_rich_type_value instead?