[lsp] make lsp/code-action tests more specific
[lsp] make lsp/code-action tests more specific

Summary: avoids unrelated changes when adding more code actions

Reviewed By: gkz

Differential Revision: D30116879

fbshipit-source-id: 028436ad7bc1477e75f0a93fffcbdd44111d22bf

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