Wired shift statuses for the current user to chip components

[AQUAiTE]

• Wrote the functions in the hooks to get the shift IDs of signed up for and assigned shifts
• Stored hook API returns (to refetch upon changes) in a useEffect()
• Added an assigned indicator and passed a combination of both to the rendered component
• The assigned indicator will always override the signed up indicator (haven't fully tested it, but this seemed to be the case which is what I wanted)
• Currently uses the primary color for the assigned indicator, but should probably change (doesn't look too good on the shift card background)