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-internal-routines-template.inc.h

@@ -141,7 +141,6 @@ const ecma_builtin_property_descriptor_t PROPERTY_DESCRIPTOR_LIST_NAME[] = {
   { name, ECMA_BUILTIN_PROPERTY_NUMBER, (prop_attributes) | ECMA_PROPERTY_FLAG_BUILT_IN, number_value },
 #define STRING_VALUE(name, magic_string_id, prop_attributes) \
   { name, ECMA_BUILTIN_PROPERTY_STRING, (prop_attributes) | ECMA_PROPERTY_FLAG_BUILT_IN, magic_string_id },
-#if JERRY_ESNEXT
 #define SYMBOL_VALUE(name, symbol) { name, ECMA_BUILTIN_PROPERTY_SYMBOL, ECMA_PROPERTY_BUILT_IN_FIXED, symbol },
 #define INTRINSIC_PROPERTY(name, magic_string_id, prop_attributes) \
   { name, ECMA_BUILTIN_PROPERTY_INTRINSIC_PROPERTY, (prop_attributes) | ECMA_PROPERTY_FLAG_BUILT_IN, magic_string_id },
@@ -150,7 +149,6 @@ const ecma_builtin_property_descriptor_t PROPERTY_DESCRIPTOR_LIST_NAME[] = {
     ECMA_BUILTIN_PROPERTY_ACCESSOR_BUILTIN_FUNCTION,                                           \
     (prop_attributes) | ECMA_PROPERTY_FLAG_BUILT_IN,                                           \
     ECMA_ACCESSOR_READ_WRITE (getter_builtin_id, setter_builtin_id) },
-#endif /* JERRY_ESNEXT */
 #include BUILTIN_INC_HEADER_NAME
   { LIT_MAGIC_STRING__COUNT, ECMA_BUILTIN_PROPERTY_END, 0, 0 }
 };