Bot appears to hang if the client sends a command with an outdated command list

[AverageHelper]

To reproduce:

1. Change the list of commands (perhaps by merging a PR into main)
2. Update the bot
3. Try to run the new command from a Desktop client, expecting the bot to reply
4. (Occasionally) observe an apparent hang, and an error in the console about DiscordAPIError[10062]: Unknown interaction
5. Reload your client
6. Try the command again, should work fine.

Not sure why Discord sends the bot interactions that are "unknown" to it, so some research will be necessary. I suspect there's nothing that our bot can do if the interaction is "unknown," since it cannot reply to the user to say so. Perhaps the bot could avoid trying to reply to "unknown" interactions.

I wonder if the interaction's commandId property has useful information that we should be checking about the command invocation, rather than the name property. Will have to investigate further.

[AverageHelper]

Would be good to answer these SO questions if we ever solve this:

• "DiscordAPIError: Unknown interaction" when trying to send info about a command
• DiscordAPIError[10062]: Unknown interaction

[AverageHelper]

The trouble might have to do with us not sending any responses at all when we get an unknown command. Sending an error response may fix this apparent hang. (Per investigation for #63)

EDIT: Alternatively, I may be barking up entirely the wrong tree here