Issue number: resolves#28344
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## What is the current behavior?
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When an Accordion is inside an Accordion Group, and the Accordion Group
is enabled and not readonly but the Accordion is disabled and/or
readonly, it is possible to navigate to the accordion and open it using
the keyboard. This should not be allowed, just like opening it on click
is not allowed.
## What is the new behavior?
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this PR. -->
- A disabled Accordion inside an Accordion Group may not be opened via
the keyboard.
- A readonly Accordion inside an Accordion Group may not be opened via
the keyboard.
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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## Other information
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screenshots of how the component looks before and after the change. -->
e10f49c43d