chore(pre_commit): remove exclusion for trailing-whitespace hook

[Borda]

This pull request includes minor updates to the .pre-commit-config.yaml and a test utility file. The main focus is on improving consistency and formatting in test content and pre-commit hook configuration.

Formatting and configuration improvements:

• Updated the FILE_2_CONTENT string in test/utils/test_file.py to have consistent newline and whitespace formatting.
• Removed the exclude: test/.*\.py rule from the trailing-whitespace hook in .pre-commit-config.yaml, so test files will now be checked for trailing whitespace.

[Copilot]

Pull request overview

This pull request removes the exclusion of test files from the trailing-whitespace pre-commit hook and updates test fixtures to comply with the stricter formatting requirements.

Key Changes:

• Removed the exclude: test/.*\.py rule from the trailing-whitespace hook in pre-commit configuration, making trailing whitespace checks apply to all Python files including tests
• Refactored FILE_2_CONTENT test fixture to eliminate trailing whitespace while maintaining semantic equivalence by converting the multiline string format to use an escaped newline character
• Removed the # noqa comment that was previously suppressing the trailing whitespace linting warning

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.pre-commit-config.yaml	Removed test directory exclusion from trailing-whitespace hook to apply consistent formatting checks across all Python files
test/utils/test_file.py	Refactored FILE_2_CONTENT string literal to eliminate trailing whitespace by using escaped newline notation, and removed the now-unnecessary noqa comment

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The changes in this PR are correct and achieve the stated goal. The string refactoring in test/utils/test_file.py maintains semantic equivalence (the resulting string value is identical), while eliminating the trailing whitespace that previously required a linting suppression comment. The pre-commit configuration change makes formatting checks more consistent across the codebase by removing the special exception for test files.

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