[SYCL] Add raii handle for UR context and device #19062
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and fix context lifetime management in command_list_manager. There were two issues: - move ctor and assignment operators were declared as default but that was incorrect - they should set context on the moved-from command_list_manager to nullptr to avoid double free. - urContextRelease() was called in the desturctor, which means it context could have been released before other members. Thiss was a problem since zeCommandList was trying to return command_list to the context's cache in it's dtor.
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and fix context lifetime management in command_list_manager. There were two issues: