fix: a more accurate type for the Select onChange prop

[haideralsh]

Description

Consider this example:

export const options = [{ value: "accepted", label: "Accepted" }];

function WithMulti() {
  return (
    <Select
      options={options}
      multiselect
      // value here is of type NDSOptionValue[]
      onChange={(value) => {
        // Do something with the value
      }}
    />
  );
}

function WithSingle() {
  return (
    <Select
      options={options}
      // value here is of type NDSOptionValue
      onChange={(value) => {
        // Do something with the value
      }}
    />
  );
}

TypeScript will infer the right type depending on whether multiselect is true or false.

Changes include

• breaking change: a change that is not backwards-compatible and/or changes current functionality
• fix: a non-breaking change that solves an issue
• feature: a non-breaking change that adds functionality
• chore: contains no changes affecting the library, such as documentation or test updates

Feature checklist

• Appropriate tests have been added
• Documentation has been updated
• Accessibility has been considered

[github-actions]

🎉 This PR is included in version 13.1.2 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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