frontend: Remove unused resolve-revision handler
Created by: ryanslade
Instrumentation showed it is not being used anymore.
Part of https://github.com/sourcegraph/sourcegraph/issues/36290
Test plan
Test still pass
Created by: ryanslade
Instrumentation showed it is not being used anymore.
Part of https://github.com/sourcegraph/sourcegraph/issues/36290
Test still pass