Window destruction and the close_project command detach the project at once and let its language servers, kernels and debug sessions shut down in the background; opening a project waits for pending shutdowns and exit waits for them with a bound.
Closes#1414
Closing a project only cancelled its agents and notebooks; its window's requests, run processes, terminal shells and debug sessions kept running until app exit, and the language server shutdown was a detached task a closing app could drop (orphaned jdtls). Closing now cancels the window's requests, kills its run processes and shells, stops its debug sessions and waits for the language servers to shut down; other windows are untouched. Terminals are keyed by owner window so they can be closed per window.
Co-authored-by: misswell <[email protected]>