examples: Add `--remove-orphans` when bringing down examples (#22702)
examples: Add `--remove-orphans` when bringing down examples (#22702)

This might resolve a very infrequent CI bug in which docker doesnt
clean up containers before removing the network.

This relates to a very long-standing docker bug that never seems to
have been fully resolved.

cf https://github.com/moby/moby/issues/17217

Signed-off-by: Ryan Northey <ea3cd978650417470535f3a4725b6b5042a6ab59@synca.io>
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