[ATR-24164] Disable chains in menu from command line

Teng Jian Khoorequested to merge
khoo/athena:master-TriggerMenu-disableChains into master

Allows adding disableChains=[...] to athena.py -c command to veto chains from the trigger menu, similar to selectChains functionality. Will only print a warning if nonexistent chains are specified, but will crash if both selectChains and disableChains are set, to avoid any ambiguity.

Needed urgently for upcoming production, to evade ATR-24052.

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