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 #25760 where toolbar icons were generating deprecation warnings in console
• Provides temporary fix while migration to new icon system is pending

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