Patch empty implicit parens on error recovery

[som-snytt]

Offer a rewrite for an erroneous application f() where the parameter list is implicit and a parameter lacks a default arg.

This was never official syntax, but was accepted from 3.3.4/3.4.2 due to a bug. The rewrite is for 3.7-migration, using the existing MigrationVersion.ImplicitParamsWithoutUsing, since that is a similar bit of syntax.

Fixes #22792

[som-snytt]

Requires a tweak: an implicit param list is not supplied implicitly if an arg list is present (but defaults may be supplied in the explicit application). It must not continue implicit application when rewriting.

Ha, in other words, canApplyImplicits should be false not true. I knew it had to be one of the two.

[som-snytt]

Added a test case for rewrite of Foo()() to Foo() instead of Foo().apply. That is a "big TODO".

[KacperFKorban]

Looks good. I just added two small comments about the code.

[som-snytt]

The spurious failure is cc timeout on posCC, negAll, runAll.

[som-snytt]

This keeps the line under 120 chars, not a standard but nice to have when feasible. class Apply line wraps at that length; it would be nice to alias constructorOnly to cO or something like in chemistry K.

[KacperFKorban]

Looks good! Sorry for taking so long, this PR got lost in my notifications 🙈