Update frontend tests to use GraphQL fixture

Nathan Friendrequested to merge
nfriend-update-release-frontend-tests-to-use-graphql-fixture into master

What does this MR do?

Updates all release-related frontend tests to use the GraphQL fixture (added in !43231 (merged)) instead of hard-coded data from mock_data.js.

The unused data in mock_data.js is removed as part of this MR.

In addition, some changes were made to the GraphQL JSON fixture in order to make it more deterministic.

This is essentially the same change as !43752 (merged), but for GraphQL data instead of REST API data.

Edited by Nathan Friend

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