[Bug]: Beam playground pydot is not defined

### What happened?

The processing has been started
error: exit status 1

Traceback (most recent call last):
File "/opt/playground/backend/executable_files/23dff4e4-dd81-4e67-9150-5b2533485bdd/23dff4e4-dd81-4e67-9150-5b2533485bdd.py", line 62, in
sample_fixed_size_globally()
File "/opt/playground/backend/executable_files/23dff4e4-dd81-4e67-9150-5b2533485bdd/23dff4e4-dd81-4e67-9150-5b2533485bdd.py", line 58, in sample_fixed_size_globally
dot = pipeline_graph.PipelineGraph(pipeline).get_dot()
File "/usr/local/lib/python3.10/site-packages/apache_beam/runners/interactive/display/pipeline_graph.py", line 113, in __init__
self._construct_graph(
File "/usr/local/lib/python3.10/site-packages/apache_beam/runners/interactive/display/pipeline_graph.py", line 240, in _construct_graph
self._graph = pydot.Dot()
NameError: name 'pydot' is not defined

### Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

### Issue Components

- [x] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner