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/builtin-objects/ecma-builtin-number.c

@@ -34,7 +34,6 @@
 #define ECMA_BUILTINS_INTERNAL
 #include "ecma-builtins-internal.h"
 
-#if JERRY_ESNEXT
 /**
  * This object has a custom dispatch function.
  */
@@ -51,7 +50,6 @@ enum
   ECMA_NUMBER_OBJECT_ROUTINE_IS_INTEGER,
   ECMA_NUMBER_OBJECT_ROUTINE_IS_SAFE_INTEGER
 };
-#endif /* JERRY_ESNEXT */
 
 #define BUILTIN_INC_HEADER_NAME "ecma-builtin-number.inc.h"
 #define BUILTIN_UNDERSCORED_ID  number
@@ -155,7 +153,6 @@ ecma_builtin_number_dispatch_construct (const ecma_value_t *arguments_list_p, /*
 #endif /* JERRY_BUILTIN_BIGINT */
 } /* ecma_builtin_number_dispatch_construct */
 
-#if JERRY_ESNEXT
 /**
  * The Number object 'isInteger' and 'isSafeInteger' routine
  *
@@ -240,8 +237,6 @@ ecma_builtin_number_dispatch_routine (uint8_t builtin_routine_id, /**< built-in
   }
 } /* ecma_builtin_number_dispatch_routine */
 
-#endif /* JERRY_ESNEXT */
-
 /**
  * @}
  * @}