Migrate WorkspaceInitialPage.js to function component

[marcaaron]

Class Component Migration

Filenames

• src/pages/workspace/WorkspaceInitialPage.js
  • type: React.Component
  • has state values: true
  • has refs: false
  • has context: false
  • lifecycle methods: none

Task

• We currently have some class components in our codebase that we would like to refactor to a function component.
• Here's a link with some general advice on how to refactor a class component to a function component: https://react.dev/reference/react/Component#alternatives
• If you need additional guidance, please ask in #expensify-open-source
• Test for any regressions and verify that there are no breaking changes

[marcaaron]

@marcaaron taking this issue off HOLD as per this Slack post

IMPORTANT: If anything unexpected pops up during the refactor/review:

• Take it to #expensify-open-source to get clarification on.
• Prefix the conversation with [HOOK REFACTOR] so that we can find it easily.
• Link the result of the conversation in this section of the Design Doc titled “Best Practices Conversations”
• Add it to the STYLE.md guide in this open PR so we can reference it and apply any teachings in the next phase