Revert "git: Intercept signing prompt from GPG when committing" (#34306)

Reverts zed-industries/zed#34096

This introduced a regression, because the unlocked key can't benefit
from caching.

Release Notes:
- N/A
625ce12a3eCole Miller committed on 7/11/2025, 11:20:35 PM· committed by GitHubparent12bc890
9 files changedLine totals unavailable