fix(addon-toolbars): suppress deprecation warning

[ValeraS]

Closes #25760

What I did

Removed deprecation warnings

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

1. Run a sandbox yarn start
2. Open Storybook in your browser
3. Open Theme menu
4. There are no warnings in the console

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

Greptile Summary

Adds __suppressDeprecationWarning prop to Icons component in the toolbar addon to temporarily silence console warnings about deprecated icon usage.

• Modified code/addons/toolbars/src/components/ToolbarMenuListItem.tsx to add __suppressDeprecationWarning={true} to Icons component
• Addresses issue [Bug]: deprecation warnings when older icons are being used #25760 where toolbar icons were generating deprecation warnings in console
• Provides temporary fix while migration to new icon system is pending

[greptile-apps]

LGTM

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