[dart:js_interop] Warn on initializers when using static interop Non-strict mode static interop can still use initializers on types like String. We should warn in this case so users don't think that the initializers will be used with invocation-level lowering. Note that strict mode does not need to worry about this as JS types can not have a const initializer. TEST=Manual as our static error checking doesn't handle warnings. Change-Id: I4e2eeda35ca82b86adf75f6eaf069764b3c13ae7 Change-Id: Ic23bd69e652ff4f083157021777d9cf46f4a7f7e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/307512 Reviewed-by: Joshua Litt <joshualitt@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Srujan Gaddam <srujzs@google.com>
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