Optional output for precice-aste-run

[fsimonis]

Main changes of this PR

Based on #210

This PR makes the --output argument of precice-aste-run of solver B optional, which disables writing the mapped data.
This can be useful in situations where only the runtime is measured and the result isn't needed.

The mapping tester also adds general>writeMapped to the setup which controls this for the entire case.

Author's checklist

• I used the pre-commit hook and used pre-commit run --all to apply all available hooks.
• I added a test to cover the proposed changes in our test suite.
• I updated the documentation in docs/README.md.
• I added a changelog entry in ./changelog-entries/ (create if necessary).
• I updated potential breaking changes in the tutorial precice/tutorials/aste-turbine.

[davidscn]

Looks good. What happens when I disable the output mesh writing/accuracy metrics and use the plotting scripts? Will it explode? As it is looking for the l2error.

[fsimonis]

Currently, only memory and runtime plots should be generated. The rest would crash. Maybe it would be an idea to change the plotting scripts to only plot the columns they find.

I'll open a separate PR

[davidscn]

Can you document this change in the main ASTE docs?

[fsimonis]

Rebased and cleaned up the PR. I'll merge after the CI passes.