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Bug: Error launching tasks that already have an execution set (e.g., from rust-analyzer CodeLens)

Bug: Error launching tasks that already have an execution set (e.g., from rust-analyzer CodeLens): a task in LegoFlow-SWE (Harbor dataset). When an extension programmatically creates a Task with a ShellExecution , ProcessExecution or CustomExecution already attached and calls executeTask , Theia…

The task

When an extension programmatically creates a `Task` with a `ShellExecution`, `ProcessExecution` or `CustomExecution` already attached and calls `executeTask`, Theia throws an error instead of running the task.

Part of Lego-X/LegoFlow-SWE.