This means that:
1. In test cases where minimal is the default (swift 5 without
-warn-concurrency), I added RUN lines for targeted, complete, and complete +
sns.
2. In test cases where complete is the default (swift 6, -warn-concurrency,
specified complete with -strict-concurrency), I added a send non-sendable run
line.
In each of these cases, I added additional expected-* lines as appropriate so
the tests can compile in each mode successfully.
This patch delays the removal of redundant isolation for inferred
global-actor isolation to Swift 6 too, since we only warn about it
changing in Swift 5. Otherwise, only isolation that is a byproduct
of inference no longer needs an await, which will probably confuse
people.
This change is with respect to SE-327, which argues that the
non-static stored properties of ordinary structs do not need
global-actor isolation.
