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Fixes issues introduced by #10110

Summary of the issue:

The following issues arose after merging #10110

1. In braille, the landmark type was no longer shown.
2. In braille, when at the start of the line, the braille cursor was positioned at the landmark role text and not at the actual start of the content. This was caused by landmarks being treated as markers, not as containers
3. The landmark role was announces for regions

Description of how this pull request fixes the issue:

1. The code that calculates the roleText for a landmark is now abstracted in the aria module. It also covers suppressing of the landmark role for regions
2. Landmarks now have presentation type container. In the braille module, an exception is made not to show the end of landmarks, as in speech. There is currently some debate on whether this is appropriate, see Entering and exiting landmarks #10420

Testing performed:

Tested the following example:

data:text/html, <p>paragraph</p><div role="region">Region without label</div><div role="region" aria-label="this is a label">Region with a label</div><div role="main">This is a main landmark</div><article>This is an article</article><p>This is a paragraph, again</p>

I've only been able to do it in Firefox yet.

Known issues with pull request:

We now announce end of article, we don't announce end of landmark. DO we agree this is OK?

Change log entry:

None