fix(server/player): setgang and setjob error handling

[Manason]

• General refactor to make the code more succinct.
• Removed unnecessary default param values
• Changed behavior of the functions to be no-op in the case of the group or grade not existing. Previously it would pick defaults instead, which seems like an undesirable behavior.
• Added error prints
• Changed removeFromJob/removeFromGang behavior when the user doesn't already have the job/gang to be no-op rather than an error scenario to make the function Idempotent. This is also useful because we don't treat the player as having the unemployed job or the none gang.
• Fixes an issue where instead of removing the old job/gang, it was attempting to remove the current one
• Prevent removing/adding to the default groups as the default groups are not tracked in the database.