move dartdevc off analyzer task model

[jmesserly]

See #33546

Also, Analyzer task model has incorrect results for some things (e.g. mixin type arguments, top-level inference) and users are hitting these.

[vsmenon]

@JekCharlsonYu - we're hoping to cherry-pick this fix for 2.1. It fixes some issues @yjbanov hit on new mixins.

[vsmenon]

@jmesserly has fix she's testing now.

[jmesserly]

I'm testing this CL: https://dart-review.googlesource.com/c/sdk/+/82469. I may need to update a more status entries, but otherwise I think it's in good shape.

edit: CL out for review.

[vsmenon]

@jmesserly - how is this looking?

[jmesserly]

I believe we can land CL https://dart-review.googlesource.com/c/sdk/+/82469 but I'll need to keep working on the debugger extension console (an internal test failing -- though it was already failing from an unrelated command line options change).