fix(radio-group): radio disabled prop can be undefined

[liamdebeasi]

Issue number: resolves #28677

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What is the current behavior?

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 but required in the Components namespace. 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?

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

Does this introduce a breaking change?

• Yes
• No

Other information

Dev build: 7.6.2-dev.11703182244.1165aeec