Currently, coder schedule only shows schedule details for a single workspace.
It would be more useful for administrators to allow them to see schedule details for multiple workspaces.

There are a number of quality-of-life improvements possible here:

• Allow specifying multiple workspaces in canonical user/workspace form e.g. coder schedule show user1/ws1 user1/ws2 user2/ws1
• Allow passing an optional --all argument to show all workspaces e.g. coder schedule show --all
• Allow filtering by status similar to coder list e.g. coder schedule show --search 'status:running' (implies --all)
• Make the output be a proper table in order to be consistent with coder list.