refactor: isolate deno_core into windmill-runtime-nativets subcrate (#7848)

* refactor: isolate deno_core into windmill-runtime-nativets subcrate

Remove deno_core from flow eval and isolate nativets V8 runtime into a
dedicated subcrate so deno_core compilation no longer blocks
windmill-worker or windmill-api.

- Create windmill-jseval crate: QuickJS-based JS eval for flow
  expressions and batch rerun, extracted from windmill-worker
- Create windmill-runtime-nativets crate: all deno_core/V8 deps and
  nativets script execution, with build.rs snapshot generation
- Simplify windmill-worker: remove all deno_* direct deps, empty
  build.rs, gate nativets behind optional dep
- Update windmill-api: use windmill-jseval for batch rerun instead of
  deno_core, remove deno_core feature entirely
- Add nativets integration tests (nativets_jobs.rs) and parallel
  stress test (nativets_stress.rs, 8 workers x 200 jobs)
- Remove dead code: deno flow eval path, USE_QUICKJS env var,
  parity tests (replaced with 63 standalone expected-value tests)

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

* fix: address PR review feedback for deno_core isolation

- Deduplicate unsafe_raw() into windmill-common/src/utils.rs (single source)
- Delete orphaned runtime.js and windmill-client.js from windmill-worker/src/
- Fix operator precedence in windmill-jseval with explicit parentheses
- Remove unnecessary return keyword in heap limit callback
- Remove redundant as usize casts
- Remove ~150 lines of commented-out code from runtime.js
- Remove commented-out #[cfg] in build.rs

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

* otel ee

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/main.rs

@@ -127,27 +127,8 @@ mod monitor;
 mod windows_service_ee;
 
 pub fn setup_deno_runtime() -> anyhow::Result<()> {
-    // https://github.com/denoland/deno/blob/main/cli/main.rs#L477
     #[cfg(feature = "deno_core")]
-    let unrecognized_v8_flags = deno_core::v8_set_flags(vec![
-        "--stack-size=1024".to_string(),
-        // TODO(bartlomieju): I think this can be removed as it's handled by `deno_core`
-        // and its settings.
-        // deno_ast removes TypeScript `assert` keywords, so this flag only affects JavaScript
-        // TODO(petamoriken): Need to check TypeScript `assert` keywords in deno_ast
-        "--no-harmony-import-assertions".to_string(),
-    ])
-    .into_iter()
-    .skip(1)
-    .collect::<Vec<_>>();
-
-    #[cfg(feature = "deno_core")]
-    if !unrecognized_v8_flags.is_empty() {
-        println!("Unrecognized V8 flags: {:?}", unrecognized_v8_flags);
-    }
-
-    #[cfg(feature = "deno_core")]
-    deno_core::JsRuntime::init_platform(None, false);
+    windmill_runtime_nativets::setup_deno_runtime()?;
     Ok(())
 }