Issue number: resolves internal
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## What is the current behavior?
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Currently, you cannot tab into a sheet modal from outside of it (the
background), even with `handleBehavior` set to `cycle`. This destroys
the accessibility of moving from the background behind a sheet modal to
the contents of a sheet modal/the drag bar to be able to cycle the size.
## What is the new behavior?
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this PR. -->
Now you can get into a sheet modal from outside of it and interact with
its contents/drag handle when `handleBehavior` is set to `cycle`. This
opens up the accessibility of the sheet modal and allows for interacting
with background elements with sheet modals open using accessibility
tools like VoiceOver and TalkBack.
## 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. -->
[Relevant test
screen](https://ionic-framework-git-fw-6523-ionic1.vercel.app/src/components/modal/test/sheet)
Dev build: `8.6.3-dev.11750971489.140836b0`
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Co-authored-by: ionitron <hi@ionicframework.com>
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