Remove obsolete temporary View Transitions code from webpack config

[westonruter]

Something that was missed as part of #2027

Props to Gemini for pointing this out.

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Pull request overview

This PR removes obsolete temporary workaround code from the webpack configuration that was manually adding 'view-transitions' to the standalone plugins array. Since 'view-transitions' has now been properly added to plugins.json (as part of PR #2027), the temporary workaround is no longer needed and is correctly being removed.

Key Changes:

• Removed the temporary workaround that manually pushed 'view-transitions' to the standalonePlugins array
• Removed the associated TODO comment explaining the workaround

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