fix(web): enable webpack tree shaking by default

[macchiitaka]

webpack tree shaking does not work by default in nx version 13. It worked in version 12.
The reason why it doesn't work is that optimization.sideEffects is set to false.

Tells webpack to recognise the sideEffects flag in package.json

cf. Optimization | webpack

Current Behavior

webpack tree shaking does not work.

Expected Behavior

webpack tree shaking works by default.

Related Issue(s)

#7283 (comment)

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✅ Successfully ran 9 targets

• nx affected --target=e2e --base=7fd7849729da3e407d0dc9247bb28e46ddf08f80 --head=3344b19c3964e86ee90daa2a994cad94339ffeba --exclude=e2e-react-native,e2e-detox,e2e-gatsby --parallel=1
• nx run-many --target=build --all --parallel=8
• nx run-many --target=build --all --parallel=8
• nx run-many --target=build --all --parallel=8
• nx run-many --target=build --all --parallel=8
• nx run-many --target=build --all --parallel=8
• nx affected --target=test --base=7fd7849729da3e407d0dc9247bb28e46ddf08f80 --head=3344b19c3964e86ee90daa2a994cad94339ffeba --parallel --max-parallel=3
• nx affected --target=build --base=7fd7849729da3e407d0dc9247bb28e46ddf08f80 --head=3344b19c3964e86ee90daa2a994cad94339ffeba --parallel --max-parallel=3
• nx build typedoc-theme

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[nadeemkhedr]

Plans to merge this PR? How can I enable that for now?

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