HTML-AAM Test Structure #62897

This is following from a conversation we had in the Interop Accessibility meeting about structuring tests for Accessibility Compat Data.

TLDR: Can we start to separate the element sub-tests out of the generic role/name test files into their own test files?

We need a way to get all the tests and sub-tests related to specific HTML-AAM features. In the proof-of-concept app for ACD, it became clear that the way the HTML-AAM tests & sub-tests are structured makes it difficult to get only the sub-tests we need, we've explored a number of different avenues with meta-data, having an ACD directory which we could manage, etc which all have their own issues.

But looking at the directory structure again, I think the solution might be more simple. The HTML-AAM directory looks like:

html-aam/
├── accname-computation-by-element/
├── heading/
├── scripts/
├── META.yml
├── WEB_FEATURES.yml
├── area-role.html
├── aside-in-prefixed-article.html
├── dir-role.tentative.html
├── figure-name-no-figcaption.tentative.html
├── hidden-names.html
├── img-src-srcset-roles.tentative.html
├── names.html
├── optgroup-role.tentative.html
├── roles-contextual.html
├── roles-contextual.tentative.html
├── roles-dynamic-switch.tentative.window.js
├── roles-generic.html
├── roles-generic.tentative.html
├── roles-minimum.tentative.html
├── roles.html
├── roles.tentative.html
└── table-roles.html

This isn't reflective of how the spec defines it's features/algorithms, and following @cookiecrook's advice in the Aug 3rd meeting, since WPT is categorised by spec, the spec directories should also map cleanly to the spec. For example, @adampage has already structured the accname-computation-by-element closer to how the spec defines the accname computation and the WPT directory structure for core-aam looks like:

role/
├── alert.py
├── alertdialog.py
├── application.py
├── article.py
├── banner.py
├── blockquote.py
├── button.py
├── button_haspopup.py
├── button_pressed.py
├── caption.py
├── cell.py
├── checkbox.py
├── code-role.py
├── columnheader.py
├── combobox.py
├── comment.py
├── complementary.py
├── contentinfo.py
├── definition.py
├── deletion.py
├── dialog.py
├── directory.py
├── document.py
├── emphasis.py
├...
└── treeitem.py

This file structure would be easier for consumers of WPT and be more legible for test-writers.