check_formalities: escape LaTeX special characters in output

[BKPepe]

The script currently inserts substrings of the commit subject and body directly into LaTeX-formatted strings for GitHub Actions output. If these substrings contain special LaTeX characters (such as underscore '_'), it causes the LaTeX rendering to fail in the CI output.

This commit introduces a helper function 'escape_latex' in 'src/helpers.sh'
which escapes common LaTeX special characters
('', '_', '$', '&', '%', '#', '{', '}').

The 'check_formalities.sh' script is updated to use this function when preparing the failure output, ensuring that the generated LaTeX is valid regardless of the commit content.

Fixes: #12 (comment)

[Copilot]

Pull request overview

This PR fixes LaTeX rendering failures in GitHub Actions output by escaping special characters in commit messages. The issue occurred when commit subjects or bodies contained LaTeX special characters (like underscores), causing the CI output rendering to fail.

Changes:

• Added escape_latex helper function to escape common LaTeX special characters
• Updated output_split_fail and output_split_fail_ex functions to apply escaping before generating LaTeX output

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/helpers.sh	Introduces new escape_latex function to escape LaTeX special characters (backslash, underscore, dollar, ampersand, percent, hash, braces)
src/check_formalities.sh	Updates output functions to escape commit text before inserting into LaTeX-formatted GitHub Actions output

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[BKPepe]

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