Revert "analyzer: Refactor @doNotStore-usage reporting using ElementUsageReporter"

This reverts commit c86cb6aa9a7820ec4720c7cf744b2081ef8784c0.

Reason for revert: Performance regression

Original change's description:
> analyzer: Refactor @doNotStore-usage reporting using ElementUsageReporter
>
> Work towards https://github.com/dart-lang/sdk/issues/62253
>
> This necessitates three behavioral changes:
>
> 1. The reported range changes FROM an entire method invocation, for
>    example, including the target and the method name and the argument
>    list, TO just the method name. This aligns with our principles and
>    how other diagnostics like this are reported.
> 2. A different warning is reported in the
>    `test_topLevelVariable_assignment_functionExpression` test case:
>    code like `var c = () => _v;` where `_v` is annotated with
>    `@doNotStore`. It used to be "assignment of do not store" and now it
>    is "return of do not store." I think this is also more correct, and
>    the logic behind the previous logic probably just has a subtle bug.
> 3. A few more expression types are counted as "storage" of a value,
>    when paired with a return statement or an assignment:
>    * as-expression
>    * target of cascage
>    * dot-shorthand property access
>    * null assert
>    * case-body of a switch-expression
>
> Change-Id: Ic3e6ad23ddbe181885f9854a891d0112fb679e8b
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/478701
> Commit-Queue: Samuel Rawlins <srawlins@google.com>
> Reviewed-by: Paul Berry <paulberry@google.com>
> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ic225f4732bedbdba2885954d4c5bad7a55eb80a8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/481840
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>