Super Scaffolded unit tests from the setup script have deprecations

[gazayas]

I think we talked about this before the Great Unbundling, but we're currently super scaffolding deprecated code after running the setup script.

> bundle exec rails test
🌱 Generating global seeds.
Run options: --seed 14945

# Running:

...................................................................................................DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/personality/notes_endpoint_test.rb:25. This will fail in Minitest 6.
.DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/personality/notes_endpoint_test.rb:25. This will fail in Minitest 6.
.DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/personality/notes_endpoint_test.rb:25. This will fail in Minitest 6.
.DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/personality/notes_endpoint_test.rb:25. This will fail in Minitest 6.
.......DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/test_sites_endpoint_test.rb:26. This will fail in Minitest 6.
.DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/test_sites_endpoint_test.rb:26. This will fail in Minitest 6.
.DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/test_sites_endpoint_test.rb:26. This will fail in Minitest 6.
.DEPRECATED: Use assert_nil if expecting nil from test/controllers/api/v1/test_sites_endpoint_test.rb:26. This will fail in Minitest 6.
..S...................................S.........

Finished in 100.758921s, 1.5879 runs/s, 8.6345 assertions/s.
160 runs, 870 assertions, 0 failures, 0 errors, 2 skips

You have skipped tests. Run with --verbose for details.