Use React.ComponentType in picker for render props

[Adjective-Object]

Pull request checklist

• Addresses an existing issue: Addresses some of the concerns raised in the conversation in Sensible defaults for ExtendedPeoplePicker #7871
• Include a change request file using $ npm run change

Description of changes

in the picker, we're using React.ComponentType in a number of places
to basically just wrap a component render.

This change expands the definitions of the render props to
ComponentType, so the consumer can just pass in the relevant
ComponentClass instead of defining a pass-through render prop.

Focus areas to test

(optional)

Microsoft Reviewers: Open in CodeFlow

[size-auditor]

Bundle test	Size (minified)	Diff from master
ExtendedPicker	210.459 kB	48 bytes

  Exceeds Tolerance       Exceeds Baseline       Below Baseline     1 kB = 1000 bytes

[leddie24]

@Adjective-Object, it looks like you're missing the change file. Can you run npm run change and commit the file please? Thank you!

[Lego6245]

This all LGTM and seems sensible, though I'm not the best person to review as it's been ages since I've touched this code.

[msft-github-bot]

🎉office-ui-fabric-react@v6.134.0 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes
• Official NPM Release
• Test the release with Developer Demo Site