Remove `has_args_schema` obsolete property from manifest

[tcompa]

Checklist before merging

• [x] I added an appropriate entry to CHANGELOG.md

[github-actions[bot]]

Coverage report

The coverage rate went from 90.47% to 90.47% :arrow_down: The branch rate is 84%.

None of the new lines are part of the tested code. Therefore, there is no coverage data about them.