update(test): Move the raw block engine tests to libsinsp

This makes it easier to test sinsp::open_raw_block and should improve
our code coverage.

Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Gerald Combs <gerald@wireshark.org>

Author: geraldcombs

test/libscap/test_suites/engines/savefile/raw_block.cpp

@@ -127,6 +127,7 @@ set(LIBSINSP_UNIT_TESTS_SOURCES
 	plugins.ut.cpp
 	plugin_manager.ut.cpp
 	prefix_search.ut.cpp
+	raw_block.ut.cpp
 	string_visitor.ut.cpp
 	filtercheck_has_args.ut.cpp
 	filter_fields_info.ut.cpp