Sychronize users between people depot and kb

### Blockers/Dependencies
None

### Overview
REPLACE THIS TEXT -Text here that clearly states the purpose of this issue in 2 sentences or less.

### Action Items
- [ ] User synch
- [ ] If PEOPLE_DEPOT_URL is defined in kb when user logs in, confirm PEOPLE_DEPOT URL works. If it doesn't work, error message and prevent creation of user.
- [ ] Prevent creation of user in KB ifcannot create in PD
- [ ] Manual tests
- [ ] Sign up for account in kb.
- From sqlite browser
- verify account is created in PD
- verify account is created in BD
- Compare user account in PD and KB
- compare to Cognito
- Log in to kb using new account - verify message no authorization
- Log in to pd using new account- verify message no authorization
- Test API call from kb to pd
- Verify call people depot URL indicates authenticated but not authorized
- Set is_staff to true in PD
- Verify call people depot urlworks
- Document manual tests
- [ ] Sign up for account in pd.
- From sqlite browser
- verify account is created in PD
- sign in to using KB cognito account
- verify account is created in KB
- Compare user account in PD and KB
- compare to Cognito
- Log in to kb using new account - verify message no authorization
- Log in to pd using new account- verify message no authorization
- Test API call from kb to pd
- Verify call people depot URL indicates authenticated but not authorized
- Set is_staff to true in PD
- Verify call people depot urlworks
- Document manual tests
- [ ] Implement and test updating user in kb, see gets changed in pd
- [ ] Decide on strategy on
- what to do if pd is down and new account is created - how to eventually resynch

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### How to Manually Verify
REPLACE THIS TEXT - Describe how to manually verify either through UI or executing the code and inspecting.

### Automated Tests
Any automated tests?

### Resources/Instructions
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