Code Insights: Fix insights muted/skipped integration tests
Created by: vovakulikov
Follow up https://github.com/sourcegraph/sourcegraph/pull/24559
Context
In this PR https://github.com/sourcegraph/sourcegraph/pull/24559 we went away from the extension API to load/fetch insight data. Cause of that system changes we have to change our approach to data mocking in integration tests. At the moment with the new system, we don't need intercept extensions bundle requests and generate bundles in tests suits. We can use the standard mechanism GQL request mocking to provide data, for now, built-in search insight and code stats insight cards.