Enable `assumeImmutableResults` in `ee/app/assets/javascripts/test_case_list/test_case_list_bundle.js`
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Set assumeImmutableResultstotruein the Apollo provider that's instantiated inee/app/assets/javascripts/test_case_list/test_case_list_bundle.js
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Verify that the app is working properly. 
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If needed, update the implementation so that the app works with immutable objects (e.g. leverage immerfor cache mutations).
Edited  by Natalia Tepluhina