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

tests/jerry/error.js

@@ -198,3 +198,12 @@ assert (URIError.prototype.constructor === URIError);
 assert (URIError.prototype.name === "URIError");
 assert (URIError.prototype.message === "");
 assert (URIError.prototype.toString() === "URIError");
+
+/* Prototype of NativeErrors should be Error */
+assert(Object.getPrototypeOf(EvalError) === Error);
+assert(Object.getPrototypeOf(RangeError) === Error);
+assert(Object.getPrototypeOf(ReferenceError) === Error);
+assert(Object.getPrototypeOf(SyntaxError) === Error);
+assert(Object.getPrototypeOf(TypeError) === Error);
+assert(Object.getPrototypeOf(URIError) === Error);
+assert(Object.getPrototypeOf(AggregateError) === Error);