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/function-param-init3.js

@@ -0,0 +1,68 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var d = 1
+function f(a = function () { return d })
+{
+  var d = 2
+  assert(d === 2)
+  assert(a() === 1)
+}
+f()
+
+var g = (a = () => d) => {
+  var d = 2
+  assert(d === 2)
+  assert(a() === 1)
+}
+g()
+
+var h = ([{a}] = [{a: function () { return d }}]) => {
+  var d = 2
+  assert(d === 2)
+  assert(a() === 1)
+}
+h()
+
+function i(a = ((eval))("(function () { return d })"))
+{
+  var d = 2
+  assert(d === 2)
+  assert(a() === 1)
+}
+i()
+
+function j(a = (([1, ((() => d))])[1]))
+{
+  var d = 2
+  assert(d === 2)
+  assert(a() === 1)
+}
+j()
+
+var m = 0
+function l(a)
+{
+  m = a
+  return m
+}
+
+function k(a = l(() => d))
+{
+  var d = 2
+  assert(d === 2)
+  assert(a() === 1)
+  assert(m() === 1)
+}
+k()