fix: storybook mocks should be in testSetupAfterEnv to make sure testing-library is cleanup properly [no issue]

[christophehurpeau]

When testing-library is loaded, it checks for an afterAll to add the cleanup step.
But when we load decorators in the test-setup, as it's in early initialization, jest has not yet initialized the hooks. So, no cleanup
I made a fix that obsiously did not work properly: #804 maybe because jest parses requires ?

Example on react-native tests (yarn test:native --no-cache):
BEFORE: 48.661s
AFTER: 35.993s

Example on web tests (yarn test:web --no-cache):
BEFORE: 203.242s
AFTER: 164.08s

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