do not run test:minified for @firebase/firestore in CI

[Feiyang1]

test:minified runs in a separate workflow

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[schmidt-sebastian]

Does this still fail PR submissions for Firestore if these tests fail? These tests are very important, as they are the only tests that can discover problems with minification. We never run them locally...

[Feiyang1]

@schmidt-sebastian yup, firestore-integration is a required workflow. https://github.com/firebase/firebase-js-sdk/blob/master/.github/workflows/test-changed-firestore-integration.yml