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.