SegmentedControl: remove the wrong aria-label in storybook

[liuliu-dev]

Related issue: https://github.com/github/accessibility-audits/issues/14898

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Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
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• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

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Pull request overview

Updates the SegmentedControl Storybook feature story to avoid overriding the buttons’ accessible names with redundant aria-labels, aligning the example with expected accessibility behavior (notably for counter labels) and addressing the referenced audit issue.

Changes:

• Removed per-button aria-label props from the “WithCounterLabels” SegmentedControl story.
• Simplified the JSX for the counter-label buttons to rely on visible text (and CounterLabel’s screen-reader text) for accessible naming.