Fixes axe-core inaccurately flagged elements as Must Fix < 24px targe…

[younglim]

…t-size

This PR adds...

• Fixes reported in ax-core including target-size: do not treat focusable tabpanels as targets (fix(target-size): do not treat focusable tabpanels as targets dequelabs/axe-core#4702) (67d4e4f), closes fix(aria-roles): correct abstract roles (types) for aria-roles dequelabs/axe-core#4421 target-size: false positive for small targets in focusable tabpanels dequelabs/axe-core#4701

• I've kept this PR as small as possible (~500 lines) by splitting it into PRs with manageable chunks of code
• I've requested reviews from 1 reviewer
• I've tested existing features (website scan, sitemap, custom flow) in both node index and cli
• I've synced this fork with GovTechSG repo
• I've added/updated unit tests
• I've added/updated any necessary dependencies in package[-lock].json npm audit, portable installation on GitHub Actions