fix flaky lsp/diagnostics test
fix flaky lsp/diagnostics test

Summary: this test doesn't care about status messages, so ignore them. not doing so causes flakiness depending on when the status messages like "done recheck" come in.

Reviewed By: nmote

Differential Revision: D19609151

fbshipit-source-id: 0a0d1536da27d781be4f6f40f23982b673c7f0ec

samwgoldman/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,samwgoldman/flow,samwgoldman/flow,samwgoldman/flow,facebook/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,samwgoldman/flow,samwgoldman/flow,samwgoldman/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow