Analyzer should warn when using UI as code features with an SDK constraint that does not guarantee support

[stereotype441]

Similar to #36024 but for the "UI as code" feature

[stereotype441]

The latest information I have from the Dart scrum team is that the first version of Dart with "UI as code" features enabled will be 2.2.2, so we should implement the warning so that it fires if the user's SDK constraint includes versions prior to 2.2.2.

If we change our minds and decide to ship 2.2.2 without "UI as code" features enabled by default, we can update the warning accordingly before doing so.

[bwilkerson]

https://dart-review.googlesource.com/c/sdk/+/96837

[stereotype441]

Fix was reverted in 0f4a208

[stereotype441]

Fix was re-landed in 495c319