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[Test/HT] Replaced 2D_Adaptive_dt_ThermalConvection_constviscosityStaggeredScheme with a new one

wenqing requested to merge wenqing/ogs:fixing_test into master

The single point pressure increment benchmark of ThermalConvection_constviscosity is vulnerable in numerical stability (sensitive to the accuracy of linear solver) to be solved by the staggered scheme. These two benchmarks are now replaced with a new benchmark. The new benchmark deals with the same problem as that of the existing benchmark, HeatTransportInStationaryFlow, but it uses the staggered scheme for decoupling.

The new benchmark is also added as a parallel computing benchmark.

For the serial computing of the new benchmark, the results of the the existing benchmark, which is HeatTransportInStationaryFlow and which uses the monolithic scheme, are taken as the reference results.

This MR fixes #3213 (closed).

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Edited by wenqing

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