Implement EGA Integration Flow for Updating Approved Users

[b-f-chan]

Implement the logical flow for integrating with the EGA API and updating their list of approved users

The flow is broken into several steps/sections, to be implemented in sequence as follows:

• Get all permissions for every approved user
• Get user info by email address and store in list
• Implement logical loop to approve all users:
  • Create permissions request for users that need it
  • Then approve above request
• Implement logical loop to remove all users NOT in DACO approved list
• Add refresh token handling

NOTE: The steps will use the function requests implemented earlier in #453

Here is the full sequence diagram for the flow: