chore: update text editor link preview story to prevent previews being added on focus

[edleeks87]

Proposed behaviour

Preview should not be added on focus of editor

Current behaviour

New preview is added on focus of editor

Checklist

• Commits follow our style guide
• Screenshots are included in the PR if useful
• Storybook added or updated if required

QA

• Tested in CodeSandbox/storybook
• Add new Cypress test coverage if required
• Carbon implementation matches Design System/designs
• UI Tests GitHub check reviewed if required

Additional context

Testing instructions

text-editor--with-link-previews story should be used for testing

The following CodeSandbox is an example of the broken behaviour.
You can see the new behaviour by looking at the version in the comment by codesandbox[bot].

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 0999398:

Sandbox	Source
carbon-quickstart	Configuration
carbon-quickstart-typescript	Configuration
carbon-quickstart	PR

[carbonci]

🎉 This PR is included in version 123.0.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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