Disable the ProtocolMCP tests.

Summary:
We get a build error that `lldb/Host/JSONTransport.h` is missing.  That's
due to D77191008. We might as well remove the ProtocolMCPServerTest.cpp
test altogether, because lldb/Host/JSONTransport.h is part of a major
DAP/MCP rewrite that we don't have, including it would be a major
endeavor.

Test Plan:
`ninja check-lldb`

Failures: P1867507908
Expected failures: [failing_unresolved_tests.txt](https://www.internalfb.com/code/osmeta-infrastructure-toolchain-build/tools/scripts/sand/filter_check_lldb_results/failing_unresolved_tests.txt)

Rollback Plan:

Reviewers: alexandreperez

Reviewed By: alexandreperez

Subscribers: pdepetro, #lldb_team

Differential Revision: https://phabricator.intern.facebook.com/D78276515

Author: dmpots

lldb/unittests/CMakeLists.txt

@@ -79,7 +79,12 @@ add_subdirectory(Thread)
 add_subdirectory(ValueObject)
 
 if(LLDB_ENABLE_PROTOCOL_SERVERS)
-  add_subdirectory(Protocol)
+# META: Disable this test for now.
+# We get a build error that lldb/Host/JSONTransport.h is missing.
+# That's due to D77191008. We might as well remove the ProtocolMCPServerTest.cpp test altogether,
+# because lldb/Host/JSONTransport.h is part of a major DAP/MCP rewrite that we don't have,
+# including it would be a major endeavor.
+# add_subdirectory(Protocol)
 endif()
 
 if(LLDB_CAN_USE_DEBUGSERVER AND LLDB_TOOL_DEBUGSERVER_BUILD AND NOT LLDB_USE_SYSTEM_DEBUGSERVER)