fix(web): restore accidentally reverted helpers and workflows from #554 (#558)

Restores the helper files, alphabetization changes, and workflow configurations
that were accidentally wiped out during the merge/rebase of PR #554.

Specifically re-applies:
- Srujan's alphabetization work (#557)
- Migration helpers and SDK 3.12 workflow bump (#552)

No changes were made to the js_interop_gen package, preserving the
dogfooded generator work from #554.