update: disabled job scanner for admins/mods

[Simplyalex99]

description: Added edge case to disable job scanner bot for admins/mods due to certain keywords like DM me that make the bot trigger for mods/admins. This is the same helper edge case used for job moderations.

[what-the-diff]

PR Summary

• Introduction of isStaff function
  The team has imported a function known as isStaff from a helper file related to our Discord application. This function aids in recognizing whether a user is part of the staff team or not.

• Message Handler Modifications
  The processing of messages has been improved to bypass those coming from a staff member. This is to ensure that only the relevant user messages are processed, making the system more efficient.

• Channel Reference Alterations in Warning Messages
  The warning messages' channel references have been updated, altering the initial reference <#${CHANNELS.jobsLog}> to now be <#${CHANNELS.jobBoard}>. This change helps to better direct the warning messages to the appropriate channel on our Discord server.