Clean up feature flag and any unused Okta code

[mehansen]

Background

We would like to migrate user roles, org membership, and facility membership to be stored within the SimpleReport app, as opposed to managing it in Okta. This will increase stability of the app and improve code readability and extensibility, among other benefits. The goal of this ticket is to clean up deprecated feature flag and Okta code.

Change requested

Clean up the feature flag and any code that's unused as a result.
If we are still doing comparisons with Okta data, clean those up now as well.

Acceptance criteria

• feature flag should not exist in our feature flag table or in our config files
• no code for authorization touches Okta EXCEPT for checking if a user is superadmin

Dependencies

• Turn on feature flag #7601

Open questions

How long do we wait to do this?

Additional context

Main design doc
Design doc - backend
Design doc - data migration plan
Okta migration tickets plan
Okta tech talk
Okta tech talk part 2