This change applies a rate limit to account email changes to prevent
enumeration on the system. The throttle is applied at the account level.
Administrators can still update an account's email address manually to
bypass this restriction if/when necessary.
This expands upon previous work done to better disconnect users from
SFTP when different events occur within Pterodactyl. This new logic also
accounts for password changes and their account being deleted entirely
from the system.
These events now trigger background jobs that will reach out to every
node they are associated with to ensure they're disconnected if
currently connected.
