Polish privacy center forms

[allisonking]

Is your feature request related to a specific problem?

There are some parts of the privacy center forms that we could polish up.

Describe the solution you'd like

• Using chakra's isRequired prop (context) instead of our own asterisk
• Use formik's isLoading instead of setting our own state
• Standardize form inputs into their own components instead of copy/pasta-ing. Perhaps we can even pull the entire identity input form into its own component that takes the configured identity inputs

Describe alternatives you've considered, if any

None of these are required, but will make things nicer

Additional context

Add any other context or screenshots about the feature request here.

[allisonking]

#2379 handles the isRequired prop 🙌