Drop support for type annotations on array.len

[tlively]

These type annotations were removed during the development of the GC proposal,
but we maintained support for parsing them to ease the transition. Now that GC
is shipped, remove support for the non-standard annotation and update our tests
accordingly.

[tlively]

Current dependencies on/for this PR:

• main
  • PR [Parser] Parse folded instructions that contain parentheses #6196
    • PR Drop support for type annotations on array.len #6197 👈
      • PR [Parser] Parse br_on_cast{_fail} input annotations #6198
        • PR [Parser] Go back to "sub final" intead of "sub open" #6199
          • PR Use the standard shared memory text format #6200

This stack of pull requests is managed by Graphite.

[tlively]

Merge activity

• Jan 3, 3:55 PM: Graphite rebased this pull request as part of a merge.
• Jan 3, 4:36 PM: @tlively merged this pull request with Graphite.