Resource only topicrefs considered duplicates by key processing

[jelovirt]

For map

<topicref href="foo.dita" processing-role="resource-only"/>
<topicref href="foo.dita" />

The latter topicref is considered a duplicate by key processing and is renamed to foo-1.dita. Resource only topicrefs should not be counted when considering duplicates.

DITA-OT 2.2

[eerohele]

This happens to fix #2134 because the test files in that issue use <keydef>, which has implicit @processing-role="resource-only", but IIRC #2134 still occurs if the key-defining topicref has a normal processing role.

[eerohele]

No, I remembered wrong, I reread what I wrote in #2134 and ran some tests and it seems this resolves #2134 as well. If something additional surfaces, we can open a new issue.

(This doesn't resolve #2242, though.)