Updates 'inactive' state for buttons

[mperrotti]

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Please read this description carefully. If you feel there is anything unclear or missing, please ask for updates.

What are you trying to accomplish?

Implements feedback from a11y team:

• inactive buttons need to meet the color contrast ratio minimum
• inactive buttons shouldn't have aria-disabled since they can still accept interactions such as:
  • hover/focus to show a tooltip
  • click/activate to show a dialog with more detailed info on why it's inactive

Screenshots

Integration

• upgrade @primer/primitives to 7.15.1

List the issues that this change affects.

Relates to https://github.com/github/primer/issues/2676

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

What approach did you choose and why?

Add a new class that styles all button variants' "inactive" state the same.

Anything you want to highlight for special attention from reviewers?

Can't think of anything

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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[changeset-bot]

🦋 Changeset detected

Latest commit: 60f0916

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

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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[github-actions]

⚠️ Visual differences found

Our visual comparison tests found UI differences. Please review the differences by viewing the files changed tab to ensure that the changes were intentional.

Review visual differences

[mperrotti]

Holding off on merging this for now. We may need another @primer/primitives upgrade...

[mperrotti]

@primer/primitives upgrade done. Safe to merge.