fix(material/button): prevents mat-icon being cut off by text-spacing

[essjay05]

Updates Angular Components Button component specifically for .mat-icon buttons to add a min-height of min-content to avoid the icon from being cut off on the bottom when text-spacing is applied.

Fixes b/411228600

BEFORE screenshot AFTER screenshot

[github-actions[bot]]

Deployed dev-app for d22b5f114382f6e11d1d8cd8570f8c289d58ac27 to: https://ng-dev-previews-comp--pr-angular-components-30891-dev-bqnj40tv.web.app

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