Main changes of this PR

This PR modifies the system test TwoActivatedMuscles to include an additional serial-explicit coupling scheme.

Motivation and additional information

This is the follow up of #1514 (comment).
The addition of the proposed serial-explicit coupling scheme, is apparently not possible, as described in #1907.

Author's checklist

• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I added a changelog file with make changelog if there are user-observable changes since the last release.
• I added a test to cover the proposed changes in our test suite.
• For breaking changes: I documented the changes in the appropriate porting guide.
• I sticked to C++17 features.
• I sticked to CMake version 3.16.3.
• I squashed / am about to squash all commits that should be seen as one.

Reviewers' checklist

• Does the changelog entry make sense? Is it formatted correctly?
• Do you understand the code changes?