[Insights] Don't seed the Top Spenders report until there is at least 2 members on the workspace.

[trjExpensify]

Coming from here. "Top Spenders" is redundant for single-workspace users, so let's not seed this suggested search until there's more than 1 workspace member.

[trjExpensify]

@TaduJR could you take this?

[TaduJR]

Sure @trjExpensify!

Thanks!

[trjExpensify]

Thanks!

[TaduJR]

PR is ready