Update PlanCreate unit test at /projects/[projectId]/dmp/create to address intermittent failures #1106

Summary

Update the unit test at /projects/[projectId]/dmp/create/__tests__/page.spec.tsx so that it doesn't intermittently get failed tests.

Context

After updating to Apollo Client v4, some of the unit tests at /projects/[projectId]/dmp/create/__tests__/page.spec.tsx were intermittently failing. It includes some very complicated tests and I believe that either MockedProvider was having some timing or memory issues causing those failures.

Links to impacted areas

It hasn't been merged yet, but it's from this PR where we updated @apollo/client to v4:#1105

Provide specific URLs to pages or other areas that would be affected

Relevant Technical Decisions

We might want to restructure the component it is testing, or move off of using MockedProvider to test this component.

Some additional comments were added in the PR for updating Apollo Client: #1105