control/controlclient: delete unreferenced mapSession UserProfiles

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This was a slow memory leak on busy tailnets with lots of tagged
ephemeral nodes.

Updates tailscale/corp#26058

Change-Id: I298e7d438e3ffbb3cde795640e344671d244c632
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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