[No QA] Docs updates for E/A#90796 Remove submitter from Change Workspace on submitted reports

[MelvinBot]

Summary

• Updates the Expense and Report Actions help site article to reflect that submitters can only use Change workspace on Draft reports, not on submitted (Outstanding) reports
• Splits the "Change workspace" table rows to show separate permissions: submitters on Draft reports only, approvers and admins before export
• Aligns documentation with the code change in Remove submitter from Change Workspace gate on submitted expense reports #90796

Test plan

• Verify the help site renders the updated tables correctly
• Confirm the permission descriptions match the current product behavior

[OSBotify]

A preview of your ExpensifyHelp changes have been deployed to https://e4bd6207.helpdot.pages.dev ⚡️

Updated articles:

• articles/new-expensify/reports-and-expenses/Expense-and-Report-Actions