Revert "gitserver: Pass pathspecs to git archive"
Created by: chrismwendt
Reverts sourcegraph/sourcegraph#32637
This might have broken the build
Test failure details: https://buildkite.com/sourcegraph/sourcegraph/builds/137447#c4ce0d73-4257-4384-957a-3c8a76215594/409
Test plan
It's a revert