Require --suite parent.suite to match the full suite name

[pekkaklarck]

When you use --test parent_name.test_name, there must be a test named test_name in a suite named parent_name and that suite must also be the root suite. On the other hand, --suite parent_name.suite_name works so that parent_name can also be a child suite. This is pretty inconsistent and needs to be changed.

The reason to requite --test parent_name.test_name to match the full suite name is that it makes it possible to explicitly pinpoint what test to run. If the name could match also partially, it could match also tests it shouldn't. For example Pabot relies on this functionality and it cannot be changed. If a partial match is needed, it's possible to use wildcards like --test *.parent_name.test_name.

I don't remember there being any reason why --suite parent_name.suite_name should also support partial matches. To make --test and --suite behavior consistent, it ought to thus be ok to change how --suite behaves. The change is backwards incompatible but we can do it in Robot Framework 7.0. I doubt this functionality is used so often that it should be deprecated first.

[pekkaklarck]

The exact behavior how --test and --suite isn't currently documented in the User Guide. I noticed that, and discovered this inconsistency, when I was writing about issues with the new Name setting (#4583) with the --suite option. I'll enhance documentation and also mention that the current behavior is subject to change.

The plan is to fix the aforementioned issue with --suite in RF 7.0 (#4688). It's good to make also other backwards incompatible --suite related changes in the same release.