FE-723: Add tooltip to button component

[alex-e-leon]

🌟 What is the purpose of this PR?

Have the Button component use the Tooltip component if a tooltip prop is passed in.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

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[cursor]

PR Summary

Medium Risk
Moderate risk: changes Button DOM structure and accessibility labeling when tooltip is set, which could affect styling, focus/hover behavior, and tests for consumers.

Overview
Adds first-class tooltip support to Button. When a tooltip string is provided, the button/link is now wrapped in the shared Tooltip component (with new tooltipOptions passthrough props), instead of relying on the native title attribute.

Also updates accessibility for icon-only buttons by defaulting aria-label to the tooltip text when there are no children, and updates Button stories to demonstrate tooltip usage and fix missing React keys in size variants.

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[augmentcode]

🤖 Augment PR Summary

Summary: Adds first-class tooltip support to the design-system Button component.

Changes:

• Introduce tooltipOptions and wrap rendered <button>/<a> with Tooltip when tooltip is provided
• Remove use of the native title attribute in favor of the DS tooltip behavior
• Update Button stories to demonstrate tooltip usage on icon-only buttons and fix missing React keys in mapped fragments

Technical Notes: Tooltip integration is implemented by building the element first, then conditionally wrapping it in Tooltip, allowing the same behavior for both anchor and button variants.

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[augmentcode]

Review completed. 2 suggestions posted.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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