Adding semaphore usage on the '/run' endpoint (#8526)

### What problem does this PR solve?

Switching threading.Lock() to asyncio.Lock(), since threading.Lock() is
blocking.

### Type of change

- [x] Performance Improvement

sandbox/executor_manager/api/handlers.py

@@ -22,23 +22,23 @@ from models.schemas import CodeExecutionRequest, CodeExecutionResult
 from services.execution import execute_code
 from services.limiter import limiter
 from services.security import analyze_code_security
-
+from core.container import _CONTAINER_EXECUTION_SEMAPHORES
 
 async def healthz_handler():
     return {"status": "ok"}
 
-
 @limiter.limit("5/second")
 async def run_code_handler(req: CodeExecutionRequest, request: Request):
     logger.info("🟢 Received /run request")
 
-    code = base64.b64decode(req.code_b64).decode("utf-8")
-    is_safe, issues = analyze_code_security(code, language=req.language)
-    if not is_safe:
-        issue_details = "\n".join([f"Line {lineno}: {issue}" for issue, lineno in issues])
-        return CodeExecutionResult(status=ResultStatus.PROGRAM_RUNNER_ERROR, stdout="", stderr=issue_details, exit_code=-999, detail="Code is unsafe")
+    async with _CONTAINER_EXECUTION_SEMAPHORES[req.language]:
+        code = base64.b64decode(req.code_b64).decode("utf-8")
+        is_safe, issues = analyze_code_security(code, language=req.language)
+        if not is_safe:
+            issue_details = "\n".join([f"Line {lineno}: {issue}" for issue, lineno in issues])
+            return CodeExecutionResult(status=ResultStatus.PROGRAM_RUNNER_ERROR, stdout="", stderr=issue_details, exit_code=-999, detail="Code is unsafe")
 
-    try:
-        return await execute_code(req)
-    except Exception as e:
-        return CodeExecutionResult(status=ResultStatus.PROGRAM_RUNNER_ERROR, stdout="", stderr=str(e), exit_code=-999, detail="unhandled_exception")
+        try:
+            return await execute_code(req)
+        except Exception as e:
+            return CodeExecutionResult(status=ResultStatus.PROGRAM_RUNNER_ERROR, stdout="", stderr=str(e), exit_code=-999, detail="unhandled_exception")