Optimize pqap.sh script

[Kohart]

Combine the pqap_stop and pqap_start functions into a single pqap_restart function and optimize interface checking.

• Replace ensure_interface_up and is_interface_up functions with a single check_and_ensure_interface_up function.
• Update pqap_start function to use check_and_ensure_interface_up instead of is_interface_up and ensure_interface_up.
• Move check_deps function to a more appropriate location in the script.
• Update main function to call pqap_restart instead of pqap_start.

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For more details, open the Copilot Workspace session.

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