react-components packages should not depend on react-icons for only class names of regular and filled icons

[GeoffCoxMSFT]

Several components in v9 depend on react-icons for the regular and filled icons class names.
This causes packages to take dependencies on react-icons when the components should be agnostic to a particular icon library used.
While tree-shaking will avoid bundle size bloat, this still causes extra package download for callers not consuming react-icons

[msft-fluent-ui-bot]

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