Adapt quotas tests to use JSON payload

[davelopez]

#11315 was a bit old and didn't have the latest changes to force JSON payload introduced in #12152 so some of these tests will start failing on dev.

How to test the changes?

• This is a refactoring of components with existing test coverage.

License

• I agree to license these contributions under Galaxy's current license.
• I agree to allow the Galaxy committers to license these and all my past contributions to the core galaxy codebase under the MIT license. If this condition is an issue, uncheck and just let us know why with an e-mail to [email protected].

[dannon]

@davelopez Thanks for the quick fix, good catch!

This selenium test has been flaky; I'm going to take a quick look at it to see what's going on, but it's not related to this work.
FAILED lib/galaxy_test/selenium/test_workflow_editor.py::WorkflowEditorTestCase::test_optional_select_data_field

@mvdbeek This sounds familiar -- didn't you add a debounce to something to handle this case elsewhere? The last letter of the entered string isn't getting detected in that test, sporadically. I dug up the history and tried something new in #12423