stubs.js: remove duplicate primitives, fix free-variables warnings, add -linkall to scrollycode test

- Remove 12 JS stubs from js_top_worker that are already provided by
basement/runtime.js and base/runtime.js (blocking_mutex, blocking_condition,
thread_yield, basement_dynamic, basement_alloc_stack_bind, caml_ml_domain_index)
- Keep caml_make_local_vect as it's needed by OxCaml compiler-libs and base
is not a transitive dependency
- Fix free-variables warnings by using proper //Provides/Requires pattern
for domain TLS shared state
- Add (link_flags (-linkall)) to odoc-scrollycode-extension test binary so
Html_page's side-effect shell registration is linked (matches real odoc binary)
- Promote test expected outputs for OCaml 5.4.1 and scrollycode extension changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>