feat: Add single node mode for query trace tool #12171
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The
TaskTraceMetadataWriterserializes and writes the entire planfragment to the task metadata file. Then, the
TaskTraceMetadataReaderdeserializes the task metadata, extracts the target trace node, and constructs
a replay node by using it.
This PR adds a single node mode that
TaskTraceMetadataWriteronly serializesthe mirror node constructed using the target trace node. In this mode, it replaces
its source nodes with
DummySourceNodeto retain the trace node's input types.