[various] Align Flutter and Dart SDK constraints (#3349)
As described in https://github.com/flutter/flutter/issues/121684, we currently have inconsistencies between Flutter SDK constraints and Dart SDK constraints; we have often updated only the former. This PR:
1. Adds CI enforcement via the repo tooling that the minimum versions are consistent.
2. Adds a new repo tooling command to update SDK constraints, to help mass-fix all the violations of the new enforcement in step 1 (and for future mass changes, such as when we update our test matrix and mass-drop support for versions that are no longe tested).
- In all cases, the looser constraint was updated to match the more restrictive constraint, such that there's no actual change in what Flutter version any package actually supports.
3. Runs dart fix --apply over all changed packages to automatically fix all of the analysis failures caused by step 2 suddenly making all of our packages able to use super parameters.
Fixes https://github.com/flutter/flutter/issues/121684
Fixes https://github.com/flutter/flutter/issues/121685
Removing unnecessary parenthesis (#7881)
This is simply removing unnecessary parenthesis from various places inside the packages. This change is because of a change to the unnecessary_parentesis lint that will trigger in these places. Here is the CL https://dart-review.googlesource.com/c/sdk/+/390161.
- https://github.com/dart-lang/linter/issues/4996
If anything else is needed please let me know.
I'd like to ask for this PR to wait a bit until the bots are run again on that CL so that I can be sure nothing else will trigger, I will come back here and update this whenever everything is complete. Thanks!