Making all unit tests binaries build in out/tests folder (project-chip#36095)

Author: Alami-Amine

examples/energy-management-app/energy-management-common/tests/BUILD.gn

@@ -23,7 +23,6 @@ config("tests_config") {
 
 chip_test_suite("tests") {
   output_name = "libEnergyTest"
-  output_dir = "${root_out_dir}/lib"
 
   public_configs = [ ":tests_config" ]
 

src/credentials/tests/BUILD.gn

@@ -43,7 +43,6 @@ static_library("cert_test_vectors") {
 
 chip_test_suite("tests") {
   output_name = "libCredentialsTest"
-  output_dir = "${root_out_dir}/lib"
 
   test_sources = [
     "TestCertificationDeclaration.cpp",