fix(PageHeader): updated type to ReactNode

[thatblindgeye]

Updates here should allow ReactNode being passed to linkProps.label since that's only being passed as a child to the PF Button component (which accepts ReactNode).

Calling String on the linkProps label and passing that to the label prop on Button is mainly a means to not break anything. The current codebase should render in the DOM a label attribute with whatever is passed to linkProps.label, and all I'm doing is stringifying that in the case where a consumer is passing anything other than a string.

With these fixes passing a ReactNode:

With these fixes passing a string:

Existing logic passing a ReactNode:

Existing logic passing a string:

[patternfly-build]

Preview: https://react-component-groups-pr-component-groups-759.surge.sh

A11y report: https://react-component-groups-pr-component-groups-759-a11y.surge.sh

[dlabaj]

Looks like there's a linting issue.

[github-actions]

🎉 This PR is included in version 6.3.0-prerelease.3 🎉

The release is available on:

• GitHub release
• npm package (@prerelease dist-tag)

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