Issue #2951317: Radios element missing "required" attribute

Closes #2951317

added 925 commits

• 2af4dbb8...f0fda63b - 924 commits from branch project:11.x
• c11fc277 - Merge branch '11.x' of github.com:drupal/drupal into 2951317-11.x

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added 428 commits

• c11fc277...928a5cbd - 427 commits from branch project:11.x
• ee64453f - Merge branch '11.x' into 2951317-11.x

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