Apply outline styles to outlined ButtonGroups with Popover children

[ggdouglas]

Fixes #0000

Related to #6966

Checklist

• Includes tests
• Update documentation

Changes proposed in this pull request:

Fixes a case where ButtonGroups that have Buttons nested in Popovers would not apply outlined styles when outlined={true} was applied to the ButtonGroup parent. For example:

<ButtonGroup outlined={true}>
    <Popover content={<FileMenu />}>
        <Button text="Click Me" />
    </Popover>
</ButtonGroup>

This behavior can be seen when toggling the outlined prop on the the Usage with popovers section of the Button docs:

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Type

• Feature
• Improvement
• Fix
• Break
• Deprecation
• Manual task
• Migration

Description

Apply outline styles to outlined ButtonGroups with Popover children

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[svc-palantir-github]

Fix outlined button groups with popover children

Build artifact links for this commit: documentation | landing | table | demo

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