Update River content and visual order

[danielguillan]

Summary

Updates the order of River content and visuals to ensure content is always first in the markup and makes the visual appear first on small viewports.

List of notable changes:

• Removes check that changed markup order based on align prop
• Ensures visuals appear above content on small viewports

Steps to test:

• Review storybook

Supporting resources (related issues, external links, etc):

• Solves https://github.com/github/primer/issues/3938
• Fixes https://github.com/github/primer/issues/3741

Contributor checklist:

• [x] All new and existing CI checks pass
• [x] Tests prove that the feature works and covers both happy and unhappy paths
• [x] Any drop in coverage, breaking changes or regressions have been documented above
• [x] New visual snapshots have been generated / updated for any UI changes
• [x] All developer debugging and non-functional logging has been removed
• [x] Related issues have been referenced in the PR description

Reviewer checklist:

• [ ] Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• [ ] Check that tests prove the feature works and covers both happy and unhappy paths
• [ ] Check that there aren't other open Pull Requests for the same update/change

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 073329d99730bd49fb04bc0c6462f3e55ed96e80

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

This PR includes changesets to release 6 packages

| Name | Type | | ------------------------ | ----- | | @primer/react-brand | Patch | | @primer/brand-primitives | Patch | | @primer/brand-e2e | Patch | | @primer/brand-fonts | Patch | | @primer/brand-config | Patch | | @primer/brand-storybook | Patch |

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[github-actions[bot]]

🟢 No design token changes found

[github-actions[bot]]

🟢 No visual differences found

Our visual comparison tests did not find any differences in the UI.