Docs updates for E/A#96267 block removing Expensify cardholder from workspace

[MelvinBot]

Explanation of Change

#96267 adds a client-side guard that blocks removing a workspace member who holds an active Expensify Card. Previously an admin could remove such a member with no warning; now a blocking Remove member message appears ("You can't remove [member] from this workspace while they have an Expensify Card. Please deactivate their card in Workspace > Expensify Card, then try again.") with a single Got it button, and the member is not removed until their card is deactivated. This behavior applies to both single-member and bulk removal.

This help-site update documents that restriction in Managing Workspace Members in New Expensify, which currently describes member removal but does not mention the Expensify Card block.

What changed

docs/articles/new-expensify/workspaces/Managing-Workspace-Members.md:

• Added a Note in the Remove Workspace Members section describing the blocking message and that the member can't be removed while they hold an active Expensify Card.
• Added an FAQ entry, How to remove a member who has an Expensify Card, with the steps to deactivate the card first (Workspaces > [Workspace Name] > Expensify Card) and then remove the member.

Source PR

#96267 ($ #94622)

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@yusufdeveloper2903, please review the files changed and confirm they reflect the current behavior. Then post a new comment saying @MelvinBot mark this PR as ready for review.