Add missing logging handler for embedded platforms for testing with Pigweed (#33105)

* Add missing logging handler for embedded platforms

* Update src/lib/support/UnitTest.cpp

Co-authored-by: Arkadiusz Bokowy <arkadiusz.bokowy@gmail.com>

---------

Co-authored-by: Arkadiusz Bokowy <arkadiusz.bokowy@gmail.com>

Author: jlatusek

src/lib/support/BUILD.gn

@@ -350,6 +350,7 @@ pw_static_library("pw_tests_wrapper") {
   public_deps = [
     "$dir_pw_log:impl",
     "$dir_pw_unit_test",
+    "$dir_pw_unit_test:logging",
   ]
   sources = [
     "UnitTest.cpp",

src/lib/support/UnitTest.cpp

@@ -1,12 +1,16 @@
 #include "UnitTest.h"
 
 #include "pw_unit_test/framework.h"
+#include "pw_unit_test/logging_event_handler.h"
 
 namespace chip {
 namespace test {
 
 int RunAllTests()
 {
+    testing::InitGoogleTest(nullptr, static_cast<char **>(nullptr));
+    pw::unit_test::LoggingEventHandler handler;
+    pw::unit_test::RegisterEventHandler(&handler);
     return RUN_ALL_TESTS();
 }