Prerelease changes

• remove useGlobalClassNames usage from next. (PR #15229 by xugao)
• Rename office-ui-fabric-react package and update references (PR #15271 by ecraig12345)
• Remove unneeded package dependencies. (PR #15456 by xugao)
• Remove keytipProps from props. (PR #15534 by xugao)
• Rename @uifabric/styling to @fluentui/style-utilities (PR #15567 by ecraig12345)
• Rename @fluentui/react-icons to @fluentui/react-icons-mdl2 (PR #15599 by tomi-msft)
• Rename @uifabric/icons to @fluentui/font-icons-mdl2 (PR #15603 by tomi-msft)
• Rename @uifabric/set-version to @fluentui/set-version (PR #15616 by tomi-msft)
• Rename @uifabric/react-hooks to @fluentui/react-hooks & @uifabric/utilities to @fluentui/utilities (PR #15629 by tomi-msft)