Stop transpiling optional chaining, nullish coalescing with babel and logical assignment operators

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Our version of webpack's acorn is too old and throws errors when we are not transpiling the optional chaining operators ?., logical assignment operators =|| and nullish coalescing operators ?? even though all our targeted browsers support it.

Therefore we need to enable manually:

After we have updated to webpack@5, we can disable these plugins.

Edited by 🤖 GitLab Bot 🤖