Revert "gitserver: Rename NoTimeout to EnableTimeout"
Created by: indradhanush
Reverts sourcegraph/sourcegraph#30884
Reverting because this comment by @keegancsmith makes sense:
The purpose of double negative is the default value in go is false. This makes it much easier to rollout changes when adding a field/etc. Also I think it's nice when you structure your fields such that the go zero values are the defaults.
@indradhanush Reading this PR it looks like we now never set EnableTimeout. Doesn't this imlpy now that we never have a timeout set which is breaking existing behaviour? IE before chris's PR every git exec command had a timeout. Now we don't have that...
Closes #31036 (closed).