fix(security): escape backslashes and dollar signs in applyEnvKeyReplacement

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- Ensure `applyEnvKeyReplacement` properly escapes special characters when inserting or appending `.env` keys.
- Add new unit tests to validate correct handling of backslashes and dollar signs.

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

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