Revert change to org user removal flow.

[rebeccacremona]

This PR restores the previous behavior of the flow to remove users from an organization: after form submission, the submitter is returned to the list of org users.

The tweak to redirect instead to a user-specific page was introduced in 8558fa3#diff-86c1f99e1e554ec8cf5e888d2c1033ffdced7ca1d91459906e8b37cdd67b711f. It works for admins, but 403s for registrar users. I'll make sure that, going forward, the tests pick that up, as part of the general refactoring of tests in #3621

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.57%. Comparing base (8fc6741) to head (6432a4b).
⚠️ Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3737      +/-   ##
===========================================
+ Coverage    69.47%   69.57%   +0.09%     
===========================================
  Files           58       58              
  Lines         7837     7843       +6     
===========================================
+ Hits          5445     5457      +12     
+ Misses        2392     2386       -6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.