Knob (Typescript): Fix valueTemplate prop type definition

[StealthC]

###Defect Fixes
Issue #6843
This pull request fixes the TypeScript definition for the valueTemplate prop in the Knob component. The previous type declaration:

valueTemplate?: (val: number) => string | string | undefined;

was incorrect and caused the prop to only accept functions, as string | undefined was interpreted as the return type of the function. This made it impossible to directly assign a string value to the valueTemplate prop.

The updated type:

valueTemplate?: ((val: number) => string | undefined) | string;

correctly allows the prop to accept either:

• A function that returns string | undefined.
• A plain string value.
• Or remain undefined.

This change ensures the valueTemplate prop works as intended with both functions and strings.

(and yes, English is not my primary language, so I used ChatGPT to generate this summary)

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