[core] Remove unnecessary @types/webpack package

[ZeeshanTamboli]

• I have followed (at least) the PR section of the contributing guide.

Closes #38660

Looks like the webpack types are not used anywhere. It was initially added in #22720.

[mui-bot]

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[michaldudak]

I found usages of webpack types in

material-ui/packages/markdown/loader.js

Line 77 in e788009

* @type {import('webpack').loader.Loader}

and

material-ui/scripts/sizeSnapshot/webpack.config.js

Line 173 in e788009

* @type {import('webpack').Configuration}

[ZeeshanTamboli]

I found usages of webpack types in

material-ui/packages/markdown/loader.js

Line 77 in e788009

* @type {import('webpack').loader.Loader}

and

material-ui/scripts/sizeSnapshot/webpack.config.js

Line 173 in e788009

* @type {import('webpack').Configuration}

@michaldudak Yes, those types are directly from the webpack package itself. You can find the types here.

[michaldudak]

Ah, ok, in this case, we can merge it.