fix(angular): removing deprecated import to fix storyshots

[manbearwiz]

Closes #21652

What I did

Update import from core-client to preview-api. Seems like this was missed as part of PR #19749.

This was causing the warning importing from @storybook/core-client is deprecated and will be removed in 8.0, please import canvas related modules from @storybook/preview-api and error TypeError: Cannot read properties of undefined (reading 'clientApi') when running storyshots.

How to test

I tested via linking to a working project. I probably can come up with a minimum reproduction case if need be, but Angular + Jest + Storyshots is sorta an interesting configuration and runs take a long time.

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Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[manbearwiz]

Rebased

[valentinpalkovic]

Hi @manbearwiz,

Thank you so much for your contribution. Might you resolve the conflicts. I will merge the PR then as soon as the pipeline is green.

[manbearwiz]

@valentinpalkovic rebased again. Should be good to go now.

[manbearwiz]

It looks like e2e tests are failing, any insight into that? they are using the cra sandbox, the change in this PR shouldn't affect that.