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/base/ecma-literal-storage.c

@@ -29,7 +29,6 @@
  * @{
  */
 
-#if JERRY_ESNEXT
 /**
  * Free symbol list
  */
@@ -56,7 +55,6 @@ ecma_free_symbol_list (jmem_cpointer_t symbol_list_cp) /**< symbol list */
     symbol_list_cp = next_item_cp;
   }
 } /* ecma_free_symbol_list */
-#endif /* JERRY_ESNEXT */
 
 /**
  * Free string list
@@ -146,9 +144,7 @@ ecma_free_bigint_list (jmem_cpointer_t bigint_list_cp) /**< bigint list */
 void
 ecma_finalize_lit_storage (void)
 {
-#if JERRY_ESNEXT
   ecma_free_symbol_list (JERRY_CONTEXT (symbol_list_first_cp));
-#endif /* JERRY_ESNEXT */
   ecma_free_string_list (JERRY_CONTEXT (string_list_first_cp));
   ecma_free_number_list (JERRY_CONTEXT (number_list_first_cp));
 #if JERRY_BUILTIN_BIGINT
@@ -729,13 +725,11 @@ ecma_snapshot_resolve_serializable_values (const ecma_compiled_code_t *compiled_
     base_p -= argument_end;
   }
 
-#if JERRY_ESNEXT
   /* function name */
   if (CBC_FUNCTION_GET_TYPE (compiled_code_p->status_flags) != CBC_FUNCTION_CONSTRUCTOR)
   {
     base_p--;
   }
-#endif /* JERRY_ESNEXT */
 
   return base_p;
 } /* ecma_snapshot_resolve_serializable_values */