src: move node_trace_writer/buffer.h to agent.cc
The headers node_trace_writer.h and node_trace_buffer.h are not used in agent.h but are more of an implementation detail of agent.cc.
This commit suggests moving the inclusion of these headers to agent.cc.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
src