Pipeline drawing: expose `timeout` parameter and increase the default

[anakin87]

End-to-End Haystack tests (executed nightly) are failing due to Mermaid timeouts during Pipeline drawing.
I can also reproduce this on Colab running one of our tutorials.

To resolve this before 2.11.0, I would:

• increase timeout (currently set to 10 seconds)
• expose a timeout parameter, to allow users control this behavior