Remove the user/admin-create endpoint

[benmartin-coforma]

Description

In theory, this allowed admins to create user profiles, primed and ready for the person to log in.

Cloudwatch shows this was actually done only a handful of times in 2021.

Additionally, imperfect sanitization of the username field could lead to CSV injection attacks, via the export on Users.jsx.

Therefore, we are removing the page altogether.

Related ticket(s)

CMDCT-4234

---

How to test

1. Log in as an admin user
2. Note that there is no link on the home page to "Create User"
3. Go to the "View / Edit Users" page
4. Note that there is no button above the table to "Add User"

Notes

n/a

---

Pre-review checklist

• [ ] I have added thorough tests, if necessary
• [ ] I have updated relevant documentation, if necessary
• I have performed a self-review of my code
• I have manually tested this PR in the deployed cloud environment

---

Pre-merge checklist

Review

• Design: This work has been reviewed and approved by design, if necessary
• Product: This work has been reviewed and approved by product owner, if necessary

Security

If either of the following are true, notify the team's ISSO (Information System Security Officer).

• [ ] These changes are significant enough to require an update to the SIA.
• These changes are significant enough to require a penetration test.

[BearHanded]

Confirmed the add button no longer exists

[codeclimate]

Code Climate has analyzed commit 900ad16 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (90% is the threshold).

This pull request will bring the total coverage in the repository to 82.3% (0.2% change).

View more on Code Climate.

[ailZhou]

made a tiny little change to the styling as the padding on the edit user button is gone but everything else looks good!