fix: Switching Carbon tabs can cause content to scroll off-viewport

[starpit]

carbon-components-react 7.23.0 (versus 7.22.0) had a few DOM-altering changes:

1. a -> button for Tab child
2. [aria-hidden=true] => [hidden]

This required a few changes to CSS rules and test selectors.

Fixes #6014

Description of what you did:

My PR is a:

• 💥 Breaking change
• 🐛 Bug fix
• 💅 Enhancement
• 🚀 New feature

Please confirm that your PR fulfills these requirements

• Multiple commits are squashed into one commit.
• The commit message follows Conventional Commits, which allows us to autogenerate release notes; e.g. fix(plugins/plugin-k8s): fixed annoying bugs
• All npm dependencies are pinned.

[codecov]

Codecov Report

Merging #6126 (9dfcb4b) into master (1ad0af8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6126   +/-   ##
=======================================
  Coverage   61.98%   61.98%           
=======================================
  Files          84       84           
  Lines        2662     2662           
  Branches      656      656           
=======================================
  Hits         1650     1650           
  Misses        769      769           
  Partials      243      243           

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[starpit]

sigh, carbon 7.23 deprecated Tab props, but itself persisted in using those props.

carbon-design-system/carbon#7237

who knows when that fix will be released...