Add alias self-assignment CopyableAtomic test

[AAmbuj]

its showing warrning as error. cause the build fail. so, i fixed it.

[castler]

We should rather ignore the warning Here, as the Test was s self assignment specificaly

[AAmbuj]

Hi @castler going this way is ok?

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wself-assign-overloaded"
unit = unit;
#pragma clang diagnostic pop

or

i remove target it self
features = COMPILER_WARNING_FEATURES + ["-score_communication_treat_warnings_as_errors"],

[AAmbuj]

I modified target.