config: make normalization of Boolean env vars case-insensitive

[radoering]

Pull Request Check List

See #10066 (comment)

• Added tests for changed code.
• Updated documentation for changed code.

Summary by Sourcery

Tests:

• Added tests for case-insensitive boolean normalization.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request modifies the boolean normalizer to be case-insensitive and to accept '1' and '0' as valid boolean values.

Flow diagram for Boolean environment variable normalization

graph TD
    A[Input String] --> B{Convert to lowercase}
    B --> C{Check value}
    C -->|'true' or '1'| D[Return true]
    C -->|other values| E[Return false]

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File-Level Changes

Change	Details	Files
Modified the boolean normalizer to be case-insensitive and to accept '1' and '0' as valid boolean values.	The boolean normalizer now converts the input to lowercase before checking if it is 'true' or '1'.	src/poetry/config/config.py
Added test cases for case-insensitive boolean values and '1' and '0' as valid boolean values.	Added test cases for 'True', 'False', '1', and '0' as valid boolean values.	tests/config/test_config.py

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[sourcery-ai]

Hey @radoering - I've reviewed your changes - here's some feedback:

Overall Comments:

• Please update the documentation to reflect that boolean environment variables now accept case-insensitive values ('true'/'True'/'TRUE', 'false'/'False'/'FALSE') and numeric values ('0', '1').

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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