totalResults has different implementation for GET and POST search

[alexey-anufriev]

Description:
GroupResourceManager#listWithGET calls GroupResourceManager#processGroupList, and inside supplied list of results is validated and first item is OPTIONALLY can represent totalResults value:

if (tempList.get(0) instanceof Integer)

But GroupResourceManager#listWithPOST explicitly retrieves the totalResults value:

totalResults = (int) tempList.get(0);

I believe these implementations must be aligned.

Affected Product Version:
3.3.38