utils: do not include unused headers

these unused includes were identified by clangd. see
https://clangd.llvm.org/guides/include-cleaner#unused-include-warning
for more details on the "Unused include" warning.

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes scylladb/scylladb#16833

test/boost/UUID_test.cc

@@ -12,6 +12,7 @@
 #include <utility>
 #include "utils/UUID_gen.hh"
 #include "utils/lexicographical_compare.hh"
+#include "marshal_exception.hh"
 
 BOOST_AUTO_TEST_CASE(test_generation_of_name_based_UUID) {
     auto uuid = utils::UUID_gen::get_name_UUID("systembatchlog");

test/boost/double_decker_test.cc

@@ -15,6 +15,7 @@
 #include <string>
 
 #include "utils/double-decker.hh"
+#include "utils/logalloc.hh"
 #include "test/lib/random_utils.hh"
 
 class compound_key {