Angular: Introduce preserveSymlink builder option

[valentinpalkovic]

Closes N/A

What I did

This PR introduces a new builder option, "preserveSymlinks", which is passed further to the underlying Angular Webpack builder.

Second, I try to finally fix the creation of Angular sandboxes in linked mode. There is one remaining caveat in linked mode, though: The code has to be built for production. For that, I have introduced a new --prod flag for the yarn task CLI so that sandboxes can be created in link mode, but the underlying packages are build for production.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

1. Run an Angular-specific sandbox with the --prod flag, e.g. yarn task --prod --task sandbox --start-from auto --template angular-cli/default-ts
2. Open Storybook in your browser
3. Make sure Storybook doesn't crash

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

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