Ignore final try suffix for annotated top-level defs

[lukewilliamboswell]

Fixes #7103

Also tested using the following program cargo run --main.roc

app [main] {
    pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.15.0/SlwdbJ-3GR7uBWQo6zlmYWNYOxnvo8r6YABXD-45UOw.tar.br",
}

import pf.Stdout
import pf.Stdin

run : Task {} _
run =
    Stdout.line! "Say something:"
    input = Stdin.line!
    Stdout.line! "You said: $(input)"

main = run

[lukewilliamboswell]

Also Fixes #7127

[smores56]

I'm not a huge fan of using a syntax error as special state to decide when to successfully continue, but:

1. We probably do this elsewhere
2. This code is going away with purity inference and the new try keyword

So it doesn't matter enough to be worth making much cleaner.