Fix using multiple Copy + Sendable types

[aDifferentJT]

This fixes #335 by adding the missing newline

[chinedufn]

Please add a #[swift_bridge(Copy(4), Sendable)] type to crates/swift-integration-tests.
Can put documentation on the type explaining why we added the test type (i.e. basically that our codegen was missing a newline so adding this type ensures that our codegen is now working).
Don't have to call the type from the Swift side. Just defining it it crates/swift-integration-tests should be enough of a test case here.

Generally we don't land code without also adding a test that would have failed before the code was added.

Let me know if you'd like me to write up a guide on how to add this test.
Seems like you already have a good sense of where things are so I won't put effort into a guide unless you ask.

Also, same feedback as #339 (review) just need to update the PR title and body with more info (you can still also link to the issue #335 ).

After that this looks good. Thanks for the detailed report and for submitting a fix.