ci/flake: `TestSearch/graphql/structural_search/Structural,_index_only,_nonzero_result` disabled

Created by: tbliu98

Test

TestSearch/graphql/structural_search/Structural,_index_only,_nonzero_result

Example failure

https://buildkite.com/sourcegraph/sourcegraph/builds/157359#0181b063-2fc7-4a43-8cc1-93b2bd6bbc69

Disabling PR

https://github.com/sourcegraph/sourcegraph/pull/37960

Additional details

No response