Remove changelog-preview.yml workflow

[alwx]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Just a removal of changelog-preview.yml

📝 Checklist

• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
• I updated the docs if needed.
• I updated the wizard if needed.
• All tests passing
• No breaking changes

🔮 Next steps

[antonis]

LGTM

[github-actions]

	Fails
🚫	Pull request is not ready for merge, please add the "ready-to-merge" label to the pull request
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Features

- Remove changelog-preview.yml workflow ([#6030](https://github.com/getsentry/sentry-react-native/pull/6030))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description or adding a skip-changelog label.

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