Banner: Deprecate icon prop in favor of leadingVisual, fix SecondaryAction styling and playground story

[liuliu-dev]

Closes #5286

This PR deprecates the icon prop in the Banner component in favor of leadingVisual. It also fixes the SecondaryAction styling and improves the Storybook Playground selecting leadingVisual.

Changelog

1. Deprecate icon prop and add leadingVisual instead
2. BannerSecondaryAction uses variant="invisible" instead of variant="link"
3. Fixed Storybook Playground control for leadingVisual

Rollout strategy

• Patch release

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)

[changeset-bot]

🦋 Changeset detected

Latest commit: 3f802ee

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/6872

[github-actions]

👋 Hi, there are new commits since the last successful integration test. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[primer-integration]

🟢 ci completed with status success.