[various] Remove unnecessary null checks (#4060)
Removes unnecessary_null_comparison: ignore from the repository analysis options. Now that Dart 3 has reached the stable channel, all fully supported customers will be running in strong mode, so the extra null checks are no longer needed. While many packages do support earlier versions, this won't break anyone, it will just mean that people who are both a) using old versions of Flutter and b) violating the API contract by passing null to a non-nullable type, won't get error messages that are as obvious, which is fine for the best-effort support level we give to pre-current-stable versions of Flutter.
[various] Remove unnecessary null checks (#4060)
Removes unnecessary_null_comparison: ignore from the repository analysis options. Now that Dart 3 has reached the stable channel, all fully supported customers will be running in strong mode, so the extra null checks are no longer needed. While many packages do support earlier versions, this won't break anyone, it will just mean that people who are both a) using old versions of Flutter and b) violating the API contract by passing null to a non-nullable type, won't get error messages that are as obvious, which is fine for the best-effort support level we give to pre-current-stable versions of Flutter.