[various] Prep for more const widgets #3139
Merged
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Similar to flutter/plugins#7074.
flutter/flutter#119673 will make a few more widgets const. This prepares the plugins repo for that change.
I chose to ignore the resulting lint for now to ensure that the plugins continue to work on older versions of Flutter. Once the change referenced above is part of the oldest Flutter version supported by the plugins, we can resolve the TODO, remove the ignore, and make the widgets in question const.