fixrule(svg_graphics_labelled, img_alt_valid) Ignore SVG & Image accessible name requirement when its ancestor is a widget or requires presentational child V4

[shunguoy]

• Rule bug: svg_graphics_labelled, img_alt_valid

This PR is related to the following issue(s):

• Fixes Ignore SVG accessible name requirement when the svg is used as the image of a button with an accessible name #2224

Testing reference:

• test/v2/checker/accessibility/rules/svg_graphics_labelled_ruleunit/svg_name_ignore.html
  Before the fix, 2 violations on "The SVG element has no accessible name".
  After the fix, only 1 of the violations shows up.
• test/v2/checker/accessibility/rules/img_alt_valid_ruleunit/img_name_ignore.html
  Before the fix, 5 violations on "The image has neither an accessible name nor is marked as decorativ"
  After the fix, only 3 of the violations show up.

I have conducted the following for this PR:

• I validated this code in Chrome and FF
• I validated this fix in my local env
• I provided details for testing
• This PR has been reviewed and is ready for test
• I understand that the title of this PR will be used for the next release notes.

Assets to aide review attached

• Links to design artifacts
• Links to video walkthrough of user experience
• Other

Definition of Done

• Peer review complete
• Secondary review complete
• Staging deployment verified