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Liam DeBeasi 75ffeee933 fix(radio-group): radio disabled prop can be undefined (#28712 )

Issue number: resolves #28677

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## What is the current behavior?
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Defining disabled a `@Prop() disabled = false` causes Stencil to mark
this property as optional. This behavior is not desired on our end, but
making the property required would be a breaking change. Additionally,
the root issue is due to how Stencil resolves types.

For example, `disabled` is [optional in the LocalJSX
namespace](e96a1457a3/core/src/components.d.ts (L6921))
but [required in the Components
namespace](e96a1457a3/core/src/components.d.ts (L2239)).
Addressing this inside of Stencil is significant breaking change. As a
result, the team has decided to compromise and support the falsy
`disabled` state for radio for now. Other Ionic components that support
the `disabled` prop also check for falsy values.

Stencil plans to de-risk this in
https://ionic-cloud.atlassian.net/browse/STENCIL-917.

## What is the new behavior?
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this PR. -->

- Radio Group now looks at falsy values instead of strictly checking
`false`.

## 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. -->


Dev build: `7.6.2-dev.11703182244.1165aeec`

2023-12-28 17:14:01 +00:00