refactor(EuiCopy): migrate from class to function component

[abhijnyan-codes]

Closes #9466

Summary

Migrated EuiCopy from a class component to a function component using useState.

Changes

• Replaced class component with function component
• Replaced this.state with useState hook
• Replaced static defaultProps with default parameter value
• Removed constructor

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00b1e06, 98693c1

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[github-actions]

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[Copilot]

Pull request overview

Refactors EuiCopy (clipboard-copy render-prop utility) from a class component to a function component using React hooks, while keeping the tooltip feedback behavior.

Changes:

• Converted EuiCopy from Component to a function component
• Replaced this.state with useState for tooltipText
• Replaced static defaultProps with a default parameter value for afterMessage

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[weronikaolejniczak]

@abhijnyan-codes Could you please sign the CLA? 🙏🏻 It's important before contributing. Thanks!

[weronikaolejniczak]

@abhijnyan-codes This seems like a syntax error:

Suggested change

	tooltipProps?: Partial
	tooltipProps?: Partial<

[weronikaolejniczak]

@abhijnyan-codes we do need this comment by the eslint-disable:

// See src/components/tool_tip/tool_tip.js for explanation of below eslint-disable

Let's please bring it back 🙏🏻