revert insights in single docker for integration tests
Created by: coury-clark
Closes https://github.com/sourcegraph/sourcegraph/issues/36515
Reverting all of the changes from adding code insights to the single docker image for the purposes of integration tests. https://github.com/sourcegraph/sourcegraph/pull/33451/files
Test plan
I ran the integration tests against this branch https://buildkite.com/sourcegraph/sourcegraph/builds/152447.