Respect limits for projects for the Random Operations test (#12184)

## Problem
The project limits were not respected, resulting in errors.
## Summary of changes
Now limits are checked before running an action, and if the action is
not possible to run, another random action will be run.

---------

Co-authored-by: Peter Bendel <peterbendel@neon.tech>

test_runner/fixtures/neon_api.py

@@ -129,6 +129,18 @@ class NeonAPI:
 
         return cast("dict[str, Any]", resp.json())
 
+    def get_project_limits(self, project_id: str) -> dict[str, Any]:
+        resp = self.__request(
+            "GET",
+            f"/projects/{project_id}/limits",
+            headers={
+                "Accept": "application/json",
+                "Content-Type": "application/json",
+            },
+        )
+
+        return cast("dict[str, Any]", resp.json())
+
     def delete_project(
         self,
         project_id: str,