Draft: Set coverageProvider to v8 in jest.config.base.js

What does this MR do and why?

Coverage report is incorrect: https://github.com/vuejs/vue-jest/issues/480

In example MR Comparing the output between:

Without coverageProvider, default value is set to babel https://jestjs.io/docs/cli#--coverageproviderprovider

yarn jest --coverage \
--coverageReporters=text \
--collectCoverageFrom=ee/app/assets/javascripts/integrations/edit/components/sections/google_cloud_iam.vue \
ee/spec/frontend/integrations/edit/components/sections/google_cloud_iam_spec.js

&

with v8 set as coverageProvider:

yarn jest --coverage \
--coverageProvider=v8 \
--coverageReporters=text \
--collectCoverageFrom=ee/app/assets/javascripts/integrations/edit/components/sections/google_cloud_iam.vue \
ee/spec/frontend/integrations/edit/components/sections/google_cloud_iam_spec.js

we can see quite a difference in the reported coverage

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