cmake: discard obsolete configure error messages
Discard the previous CMake configure error message before creating an import job for the same project and when the project is closed. Currently the user has to manually close one message per failed CMake import job. With the discarding of obsolete messages, the user can fix the issue, possibly reload the project, and the error message will disappear automatically. If fixing the CMake configure issue takes several attempts, the user will have to close at most one error message (or none at all if the issue is ultimately fixed).
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