Revert "repos: Fix external service config overwrite during long sync…
Created by: tsenart
…s (#34638)"
This reverts commit 1a72c9586831b295eb8fe55a50ccd2593b4b6aa6. It caused #inc-99-cannot-add-repositories-on-cloud, reason unknown so far. Perhaps the transaction blocked indefinitely?
Test plan
N/A - Revert