Pytest: Add CBF for pytests

[andreasgriffin]

• github workflow: parallel fulcrum and cbf pytests
• added minimal cbf sync example in tests/test_cbf_update.py
• Implicitly tests P2PListener
• todo in tests/non_gui/test_wallet_ema_fee_rate.py
• only use the test port. disable p2p discovery
• remove the mining of a block that was added

Required

• pre-commit install before any commit. If pre-commit wasn't run for all commits, you can squash all commits git reset --soft $(git merge-base main HEAD) && git commit -m "squash" and ensure the squashed commit is properly formatted
• All commits must be signed. If some are not, you can squash all commits git reset --soft $(git merge-base main HEAD) && git commit -m "squash" and ensure the squashed commit is signed
• UI/Design/Menu changes were tested on macOS, because macOS creates endless problems. Optionally attach a screenshot.

Optional

• Update all translations
• Appropriate pytests were added
• Documentation is updated
• If this PR affects builds or install artifacts, set the Build-Relevant label to trigger build workflows