[WIP] Introduce test suite for SwiftBuildSystemMessageHandler
#9437
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* Built tentative test class SwiftBuildSystemOutputParser to handle the compiler output specifically * Added a handleDiagnostic method to possibly substitute the emitEvent local scope implementation of handling a SwiftBuildMessage diagnostic
* the flag `appendToOutputStream` helps us to determine whether a diagnostic is to be emitted or whether we'll be emitting the compiler output via OutputInfo * separate the emitEvent method into the SwiftBuildSystemMessageHandler
* Remove taskStarted outputStream emissions * Propagate exception if unable to find path
The TaskDataBuffer introduces some extra complexity in its handling of various buffers we'd actually like to track and emit, rather than ignore. We will keep multiple buffers depending on the information we have available i.e. whether there's an existing task signature buffer, taskID buffer, targetID buffer, or simply a global buffer.
If there is no command line display strings available for a failed task, we should demote this message to info-level to avoid cluttering the output stream with messages that may not be incredibly helpful. To consider here: if this is the only error, we should be able to expose this as an error and perhaps omit "<no command line>".
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Currently branched off of swb/diagnosticcodesnippet.