RelativeTime: Remove title from Lookbook previews

[TylerJDev]

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What are you trying to accomplish?

Context https://github.com/github/accessibility-audits/issues/10169, https://github.com/github/primer/issues/4769

Integration

No

List the issues that this change affects.

https://github.com/github/accessibility-audits/issues/10169

Removes title from RelativeTime previews via the no_title argument.

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.

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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Latest commit: 633aabc

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