Make dynamic core own its core data state

[Francyrad]

Summary

• Remove the duplicated core_data copy from the core statistics postprocessor.
• Keep DynamicCore as the single owner of the dynamic core restart state.
• Let core statistics read the current core data directly from the dynamic core boundary temperature plugin when it writes statistics.

Motivation

Follow-up to #6962. Now that the dynamic core boundary temperature plugin serializes its own state, the old postprocessor-side core_data copy is no longer needed and can overwrite the plugin state on restart.

Testing

• cmake --build build-debug --target aspect -j20
• cmake --build build-debug-nounity --target aspect -j20
• ASPECT_SOURCE_DIR=/home/francyrad/Documenti/aspect_debug/aspect_dynamic_core_coredata_single_owner_work ctest --output-on-failure -R '^dynamic_core' -j20
  • dynamic_core passed
  • dynamic_core_fully_solid passed
  • dynamic_core_fully_molten only differs in the last digit of two time values on this local deal.II 9.6.1 build
• Manual checkpoint/resume smoke test for dynamic_core: restart resumed from the checkpoint and continued with Dynamic core data updated instead of reinitializing the core.
• Manual smoke test without the core statistics postprocessor: dynamic core ran with velocity statistics only.

[Francyrad]

@gassmoeller