unnecessary_parenthesis not detected around literals and simple identifiers

These unnecessary parentheses should be dropped, but they are not reported:

void f() {
  final a1 = '' + ('');
  final a2 = (a1.length) * 2;
  final a3 = ((a1.isEmpty), 2);
  final a4 = (1, (2));
}

In order to address dart-lang/linter#4354, we are reporting a few mor…

[flutter_migrate] Remove one set of parens that wrap a single String …

lint: correct some simple unnecessary_parenthesis cases found internally

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