x/tools/gopls/internal/test/integration/codelens: spurious TestGCDetails_Toggle failure

[adonovan]

Observed in one builder in the context of https://go.dev/cl/585277; test passed after re-try.

--- FAIL: TestGCDetails_Toggle/default (2.01s)
    gcdetails_test.go:52: waiting on:
        Unmeetable: once "All of:\ncompleted work \"diagnosing opened files\" at least 1 time(s)" is met, must have:
        any diagnostics for file "main.go", with message containing "42 escapes", with diagnostic "optimizer details" with severity Information and tag []
        
        err:condition has final verdict Unmeetable
        
        state:
        #### log messages (see RPC logs for full text):
        	Info: "2024/05/16 03:04:39 Created View (#11)\n\tdirector...
        	Info: "2024/05/16 03:04:40 go/packages.Load #27\n\tview_i...
        
        #### diagnostics:
        	main.go (version 1):
        
        #### outstanding work:
        	diagnosing unknown file modification: 0.00
        #### completed work:
        	Checking telemetry prompt: 1
        	diagnosing opened files: 1
        	Toggling GC Details: 1
        	diagnosing initial workspace load: 1
        	Setting up workspace: 1
...
       ```