Build builder-webpack5 with ts-up

[tolkadot]

getting the following build warnings :

@storybook/builder-webpack5:

 WARN  ▲ [WARNING] "./presets/preview-preset.ts" should be marked as external for use with "require.resolve" [require-resolve-not-external]

    src/index.ts:264:44:
      264 │ ...t corePresets = [require.resolve('./presets/preview-preset.ts')];
          ╵                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@storybook/builder-webpack5:

 WARN  ▲ [WARNING] "./presets/custom-webpack-preset.ts" should be marked as external for use with "require.resolve" [require-resolve-not-external]

    src/index.ts:265:48:
      265 │ ...resets = [require.resolve('./presets/custom-webpack-preset.ts')];
          ╵                              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

@ndelangen - Any advice on how to resolve these warnings?

Issue:

What I did

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[socket-security]

Socket Security Report

👍 No new dependency issues detected in pull request

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[ndelangen]

@tolkadot thank you so much for getting this started. As suspected it wasn't an easy one to do. I hope you don't mind me picking this up and getting it across the line. Well... I hope that's what I did to be honest. CI still needs to approve, and a code-review needs to happen 🙈

@shilman Would you be able to review this?