fix(security): improve .env file handling and add unit tests for helper functions

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- Suppress warnings in `file_get_contents` to prevent unnecessary error logs.
- Update `applyEnvKeyReplacement` to use `preg_replace_callback` for better safety.
- Add comprehensive unit tests for `security_helper` functions to ensure `.env` updates and key management work as expected.

Signed-off-by: objecttothis <17935339+objecttothis@users.noreply.github.com>

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