[TimeLoop] Allow time stepping continue after nonlinear fails in the staggered coupling loop
As titled. With the existing implementation, the program quits running once the nonlinear solver of a process fails in the staggered coupling loop. This MR makes a change that the nonlinear solver divergence only breaks the staggered coupling loop.
This is a commit of MR !3095 (closed).
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Feature description was added to the changelog? Yes