[5.0] fix new signedness warnings to have a clean build for rc3

[linh2931]

Fix new warnings so we have a clean rc3 build

plugins/net_plugin/tests/rate_limit_parse_unittest.cpp:23:4:   required from here
libraries/boost/libs/test/include/boost/test/tools/old/impl.hpp:107:17: warning: comparison of integer expressions of different signedness: ‘const long unsigned int’ and ‘const int’ [-Wsign-compare]

...

plugins/state_history_plugin/tests/session_test.cpp:488:25: warning: comparison of integer expressions of different signedness: ‘int’ and ‘const uint32_t’ {aka ‘const unsigned int’} [-Wsign-compare]
  488 |       for (int i = 0; i < head; ++i) {
      |                       ~~^~~~~~

Resolves #1835