Remove ES_NEXT macro (#4915)

- remove all '#JERRY_ESNEXT' macro
- remove 5.1 build profile, update test runner accordingly (Note: all builtins are turn on by default)
- move tests from tests/jerry/esnext into tests/jerry, concatenate files with same names
- add skiplist to some snapshot tests that were supported only in 5.1
- fix doxygen issues that were hidden before (bc. of es.next macro)

Co-authored-by: Martin Negyokru negyokru@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

jerry-core/ecma/operations/ecma-async-generator-object.c

@@ -32,8 +32,6 @@
 #include "vm-stack.h"
 #include "vm.h"
 
-#if JERRY_ESNEXT
-
 /** \addtogroup ecma ECMA
  * @{
  *
@@ -126,6 +124,9 @@ ecma_async_yield_call (ecma_value_t function, /**< function (takes reference) */
 
 /**
  * Perform an exception throw and call the approprite handler
+ *
+ * @return ecma value
+ *         Returned value must be freed with ecma_free_value.
  */
 static ecma_value_t
 ecma_async_yield_throw (vm_executable_object_t *async_generator_object_p, /**< async generator */
@@ -516,8 +517,6 @@ ecma_await_continue (vm_executable_object_t *executable_object_p, /**< executabl
   }
 } /* ecma_await_continue */
 
-#endif /* JERRY_ESNEXT */
-
 /**
  * @}
  * @}