[BE] 10-10CG - OAuth2.0: Update engineering documentation to reflect OAuth2.0 flow

[hdjustice]

Background

Now that the OAuth2.0 has been implemented in Production, we need to create and/or update engineering documentation to include this information. This may consist of simple diagrams, a short write-up, or other similar documentation that will be a useful resource.

Resources

• Exploration ticket
• Development ticket - #86425
• Helpful info for OAuth 2.0 Client Credential flow with Okta is here

Tasks

• [x] Create documentation that best outlines how OAuth2.0 impacts our workflow and codebase
• [x] Review with the team/PM
  • [x] Signoff is documented within the comments of this ticket

Acceptance Criteria

• Engineering documentation includes the new OAuth2.0 details.

[hdjustice]

Reviewed documentation and it captures all connections and flow, including OAuth changes. Thanks!