uucore: fix clippy::pedantic warnings in build.rs and generated locale code

[skjha98]

Description: This PR addresses several clippy::pedantic warnings related to the locale embedding logic in uucore.

Changes:

• Added a missing # Errors section to the embed_locale_file documentation in build.rs.
• Updated the code generator in build.rs to dynamically handle raw string literals. It now detects if the translation content contains double quotes and uses the appropriate hash delimiter (r"..." vs r#"..."#).
• This fix resolves clippy::needless_raw_string_hashes in the generated output.

Testing: Verified by running cargo clippy -p uu_whoami -- -W clippy::pedantic and confirming the warnings related to build.rs and the generated locale code are gone.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/tail/follow-name is no longer failing!

[sylvestre]

Could you please update github action to run it in the ci?