fix: limit multi-runnable dedicated workers to one job at a time (#8782)

* feat: thread concurrency semaphore through dedicated worker executors

Pass the concurrency_semaphore parameter through bun, deno, and python
start_worker functions to handle_dedicated_process. Also fix the
DedicatedWorkersSelector to use listWorkspacesAsSuperAdmin (so all
workspaces including admins are visible) and skip loading when disabled.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: update ee-repo-ref to limit-workers-one-job branch

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: update ee-repo-ref to 54037e77cdd37777560755fef7075d35906c96d8

This commit updates the EE repository reference after PR #523 was merged in windmill-ee-private.

Previous ee-repo-ref: 56890ea8fca2c1c44a1338a27011b4dd1137d9c9

New ee-repo-ref: 54037e77cdd37777560755fef7075d35906c96d8

Automated by sync-ee-ref workflow.

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: windmill-internal-app[bot] <windmill-internal-app[bot]@users.noreply.github.com>
Co-authored-by: Ruben Fiszel <ruben@windmill.dev>

backend/windmill-worker/src/python_executor.rs

@@ -2780,6 +2780,7 @@ pub async fn start_worker(
     jobs_rx: tokio::sync::mpsc::Receiver<DedicatedWorkerJob>,
     killpill_rx: tokio::sync::broadcast::Receiver<()>,
     client: windmill_common::client::AuthedClient,
+    concurrency_semaphore: Option<std::sync::Arc<tokio::sync::Semaphore>>,
 ) -> error::Result<()> {
     use crate::PyV;
     tracing::info!("script path: {}", script_path);
@@ -2922,6 +2923,7 @@ pub async fn start_worker(
         "python",
         client,
         false,
+        concurrency_semaphore,
     )
     .await
 }