chore(cat-gateway): Remove #[allow(dead_code)] where it is actually not dead code

[apskhem]

Description

Removed #[allow(dead_code)] where it is actually not dead code.

Related Issue(s)

Closes #1721

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 449/449}$ | ${\color{red}Fail: 0/449}$ |

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 455/455}$ | ${\color{red}Fail: 0/455}$ |