fix(CopyIcon): Replace CopyIcon with RhUiCopyFillIcon

[rebeccaalpert]

What:
This is one piece of #12400. Breaking it up by icon so it is easier to review.

As a follow on, we may also want to update org: patternfly/patternfly-org#5036

Additional issues:

Summary by CodeRabbit

• Style
  • Updated copy icon appearance across CodeEditor, Button, ClipboardCopy, CodeBlock, ToggleGroup, Tooltip, and demo applications for a consistent visual experience.

[coderabbitai]

Walkthrough

Replace the deprecated CopyIcon with PatternFly's RhUiCopyFillIcon across core production components, component examples, documentation, and the demo application in a single coordinated update.

Changes

Icon replacement migration

Layer / File(s)	Summary
Core production implementation packages/react-code-editor/src/components/CodeEditor/CodeEditor.tsx, packages/react-core/src/components/ClipboardCopy/ClipboardCopyButton.tsx	CodeEditor and ClipboardCopyButton import and render RhUiCopyFillIcon instead of CopyIcon for their respective copy button icons.
Component examples and documentation packages/react-core/src/components/Button/examples/*, packages/react-core/src/components/CodeBlock/examples/CodeBlock.md, packages/react-core/src/components/ToggleGroup/examples/*, packages/react-core/src/components/Tooltip/examples/*	Button, CodeBlock, ToggleGroup, and Tooltip example components and markdown files update their icon imports from CopyIcon to RhUiCopyFillIcon, demonstrating the new icon variant across six component families.
Demo application packages/react-integration/demo-app-ts/src/components/demos/ToggleGroupDemo/ToggleGroupDemo.tsx	ToggleGroupDemo adds the RhUiCopyFillIcon import and updates two ToggleGroupItem copy buttons to use the new icon.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Suggested labels

Needs design review

Suggested reviewers

• nicolethoen
• thatblindgeye
• kmcfaul

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: replacing CopyIcon with RhUiCopyFillIcon across the codebase. It is concise, accurate, and directly relates to all file modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[patternfly-build]

Preview: https://pf-react-pr-12449.surge.sh

A11y report: https://pf-react-pr-12449-a11y.surge.sh