IconButton: Fix flaky visual screenshot test

[siddharthkp]

• Noticed this test was failing on unrelated PRs after Add delay functionality to tooltips #6889.
  • Example: Change two MCP descriptions to see if usage improves #6969 (comment)
• Quick and dirty fix is to wait a little longer than the default short delay. Done better than perfect.

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Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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Pull Request Overview

This PR fixes a flaky visual regression test for the IconButton component by adding a small timeout to ensure stable screenshots. The test was failing intermittently after a previous change, likely due to timing issues with tooltip display animations.

• Adds a 100ms timeout after tooltip becomes visible to ensure screenshot stability
• Reformats existing waitFor call for consistency
• Includes ESLint disable comment for the timeout usage