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/parser/js/parser-error-messages.ini

@@ -73,7 +73,6 @@ PARSER_ERR_INVALID_LHS_FOR_LOOP = "Invalid left-hand-side in for-loop"
 PARSER_ERR_INVALID_LHS_POSTFIX_OP = "Invalid left-hand side expression in postfix operation"
 PARSER_ERR_INVALID_LHS_PREFIX_OP = "Invalid left-hand side expression in prefix operation"
 PARSER_ERR_INVALID_NULLISH_COALESCING = "Cannot chain nullish with logical AND or OR"
-PARSER_ERR_INVALID_NUMBER = "Invalid number"
 PARSER_ERR_INVALID_OCTAL_DIGIT = "Invalid octal digit"
 PARSER_ERR_INVALID_RETURN = "Return statement must be inside a function body"
 PARSER_ERR_INVALID_RIGHT_SQUARE = "Unexpected '}' token"
@@ -103,7 +102,6 @@ PARSER_ERR_NON_STRICT_ARG_DEFINITION = "Non-strict argument definition"
 PARSER_ERR_NO_ARGUMENTS_EXPECTED = "Property getters must have no arguments"
 PARSER_ERR_NUMBER_TOO_LONG = "Number is too long"
 PARSER_ERR_OBJECT_ITEM_SEPARATOR_EXPECTED = "Expected ',' or '}' after a property definition"
-PARSER_ERR_OBJECT_PROPERTY_REDEFINED = "Property of object literal redefined"
 PARSER_ERR_OCTAL_ESCAPE_NOT_ALLOWED = "Octal escape sequences are not allowed in strict mode"
 PARSER_ERR_OCTAL_NUMBER_NOT_ALLOWED = "Octal numbers are not allowed in strict mode"
 PARSER_ERR_OF_EXPECTED = "Expected 'of' token"