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/regression-test-issue-3072.js

@@ -16,3 +16,13 @@ var arr = [ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ];
 arr [4294967294] = 0
 assert (arr.length === 4294967295);
 assert (arr[4294967294] === 0);
+
+var arrb = new ArrayBuffer(13);
+
+try {
+  var d = new DataView(arrb, 12, -Infinity);
+  d.setFloat32(1, 1);
+  assert (false);
+} catch (e) {
+  assert (e instanceof RangeError);
+}