Add SVG name fallback tests from aria attrs to host lang title etc

[cookiecrook]

From @rahimabdi in: https://github.com/web-platform-tests/wpt/pull/43196/files#r1398016611

What happens to the <svg>'s name if the <a> is simultaneously named via another technique, e.g., aria-label/aria-labelledby/title? Per section 8.1 of svg-aam, it's unclear if xlink:title takes precedence.

Since both the title element and the xlink:title attr are defined as the host language label mechanisms, then both of these have lower precedence than the ARIA labeling attrs. Some new SVG-AAM comp_label and comp_labelledby test files could cover those variants.