Revert "Preserve non-synthetic function types when resolving invocations of functions with type parameters"

This reverts commit 7ad5a57bf226f5e71ac45cff4c512bb33c089de5.

Reason for revert:

This breaks tests in Flutter. In particular, it causes the lint `avoid_redundant_argument_values` to start producing diagnostics in places where it wasn't previously able to do so.

The failures can be seen at https://logs.chromium.org/logs/dart/buildbucket/cr-buildbucket/8756630800427013937/+/u/analyze_flutter_flutter/stdout.

In order to re-land this CL we will first need to verify that all of the new reports are valid (that there aren't any false positives), and then fixes will need to land in flutter. After that we can try re-landing this CL.

Original change's description:
> Preserve non-synthetic function types when resolving invocations of functions with type parameters
>
>
> Update existing tests to require existing parameter elements
>
>
> Add tests for staticParameterElement in generic functions
>
> R=leafp@google.com
>
> Bug: https://dartbug.com/54669
> Change-Id: Ie899f58df56ad1a6b49426ca4d7f4e611975b284
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/350920
> Auto-Submit: Mylo Fawcett <mylo.fawcett@gmail.com>
> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>

Bug: https://dartbug.com/54669
Change-Id: I29cade78577eac8442eb53a7d9c38d384e7913c3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/351682
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>