fix(jetbrains): fake KiloRunService in AgentManagerPanelTest

WorktreeController.remove calls service<KiloRunService>().release(...) to
stop worktree run processes before removal. AgentManagerPanelTest never
replaced that app service, so the call went through the real durable RPC
path with no backend and the removal coroutine never reached
service.remove(...), failing the merged-in "deleting a worktree closes and
releases its worktree session editor" test.

Replace KiloRunService with FakeRunRpcApi in setUp, matching the pattern
already used for KiloWorktreeService/GhStatusCoordinator in this test and
for KiloRunService in WorktreeRunControlTest.