Added Dialog wrapper for portalContainer and gave inspector z-index o…

[Ryanseanlee]

…f 999

remove modal and collapsible support for inspector

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• Caught up with develop branch as of last change.
• Added CHANGELOG entry, or determined not required.
• Reviewed for breaking changes, added breaking-change label + CHANGELOG if so.
• Updated doc comments / prop-types, or determined not required.
• Reviewed and tested on Mobile, or determined not required.
• Created Toolbox branch / PR, or determined not required.

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