fix(nextjs): return correct webpack config for next.js storybook app

[jaysoo]

This MR fixes a couple of issues with the webpack configuration function from @nrwl/webpack:webpack.

1. Default target is not set if config function is called directly, and not through the webpack executor.
2. Default compiler is returning a conflicting webpack loader for *.tsx files. Previously this only happened if compiler is explicitly set as babel.

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #12186
RyanClementsHax/storybook-addon-next#100
#12320

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• nx affected --target=test --base=77b57b78e8f91ce1f2a3a3c674587909b405a76d --head=76eac0734664c1cf8269a7213f1f73aa66051b98 --parallel=1
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Name	Status	Preview	Updated
nx-dev	⬜️ Ignored (Inspect)		Oct 4, 2022 at 2:29AM (UTC)

[mandarini]

Perfect! All works now, tried it locally! Users can now run and build Storybook for Next.js apps.

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This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.