Cfd dem restart files

[OGaboriault]

Description

Since the implementation of the double restarts in the dem solver, checkpoint files generated from the dem solver were not longer compatible from the get-go with the CFD-DEM solvers (lethe-fluid-vans and lethe-fluid-particles) since the prefix changed.

Solution

The CFD-DEM solvers now read the ".checkpoint_controller" file to check which version of checkpoint files should be read.

Testing

Every CFD-DEM application tests were updated with the new file names. ( I made sure to rename the file in my IDE so that git keeps track of the change, aka no deleted and new files)

Documentation

N/A

Miscellaneous (will be removed when merged)

Double restarts shouldn't affect this change.

Checklist (will be removed when merged)

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Code related list:

• All in-code documentation related to this PR is up to date (Doxygen format)
• Copyright headers are present and up to date
• Lethe documentation is up to date
• Fix has unit test(s) (preferred) or application test(s), and restart files are in the generator folder
• The branch is rebased onto master
• Changelog (CHANGELOG.md) is up to date
• Code is indented with indent-all and .prm files (examples and tests) with prm-indent

Pull request related list:

• Labels are applied
• There are at least 2 reviewers (or 1 if small feature) excluding the responsible for the merge
• If this PR closes an issue or is related to a project, it is linked in the "Projects" or "Development" section
• If the fix is temporary, an issue is opened
• The PR description is cleaned and ready for merge