Replace BarsIcon with RhUiMenuBarsIcon

[nicolethoen]

Summary

Replace all usages of the legacy FA BarsIcon with the RH brand RhUiMenuBarsIcon.

Linked PR

• chore(BarsIcon): Updat all uses of Bars icons to use RhUiMenuBarsIcon instead #12377

Acceptance Criteria

• All BarsIcon imports replaced with RhUiMenuBarsIcon

• No broken links or references as a result of the change

• Tests pass

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Jira Issue: PF-4087

[coderabbitai]

🔗 Related PRs

#12366 - chore(ExternalLinkSquareAltIcon): Replace all usages of ExternalLinkSquareAltIcon with RhUiExternalLinkFillIcon [merged]
#12371 - chore(Star Icons): Replace all star FA icons with RH brand star icons [merged]
#12376 - chore(EmptyState): Update use a RH brand icon in tests [merged]
#12378 - chore(BlueprintIcon): Update all uses of BlueprintIcon to use RhUiBlueprintIcon instead [merged]
#12379 - chore(OutlinedQuestionCircleIcon): Update uses of OutlinedQuestionCircleIcon to use RhUiQuestionMarkCircleIcon [merged]

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