[linter] make_ wildcards

[stephane-archer]

for reference: https://github.com/dart-lang/language/blob/main/accepted/future-releases/wildcard-variables/feature-specification.md

try {
  throw '!';
} catch (e) {
  print('oops');
}

should quick fix to:

try {
  throw '!';
} catch (_) {
  print('oops');
}

---

list.where((e) => true);

to

list.where((_) => true);