[analysis_server] Fix flaky test This test was writing a package_config after starting the analysis server which causes the context roots to be rebuilt (during which there is a period when there are no roots/drivers), and then not waiting. This change creates the file before server initialisation. Change-Id: Id0111f16200a905dd538e217199133122be84246 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/319801 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
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