[Bug]: dyno missing init-part when tuple splitting

[riftEmber]

Summary of Problem

Description:
Dyno encounters an error assigning a variable via splitting a tuple formal containing a class type. It seems to be missing an init-part for the variable being initialized, so tries to default-init it, which is not possible for a non-nil class type.

Is this issue currently blocking your progress?
Blocking for #26077.

Steps to Reproduce

Source Code:

Simpler reproducer:

class Foo {}

proc asdf () {
  var (first) = (new Foo(),);
}
asdf();

Original reproducer:

proc asdf(x) {
  var (first) = x;
}

class Foo {
  proc bar() {
    var tup = (this,);
    asdf(tup);
  }
}

var myFoo = new Foo();
myFoo.bar();

Compile command:
testInteractive or chpl --dyno

Results in error message:

─── error in mytest.chpl:2 ───
  Cannot default initialize variable using non-nilable class type

[riftEmber]

It doesn't have to be a borrowed, just anything that can't be default-inited, since the underlying problem is missing init part. And it doesn't have to be a formal, just in a proc so call-init-deinit checks happen. Added simpler reproducer and changed title.

[riftEmber]

Another reproducer that gets all the way through production:

class Foo {}
proc asdf () {
  var myFoo = new Foo();
  var (first, second) = (myFoo.borrow(), 2);
}
asdf();

[riftEmber]

Made backing issue https://github.com/Cray/chapel-private/issues/7021