Unnecessary assertion in constructor.

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In RadiationDescriber.ts:

class RadiationDescriber {

  public constructor() {

    // At the time of this writing (Aug 2023), there are only static usages of this type, so the constructor has been
    // disallowed.  If state is ever needed, feel free to change this.  See
    // https://github.com/phetsims/greenhouse-effect/issues/339.
    assert && assert( false, 'Intended, at least originally, to only be used statically.' );
  }

The assertion is unnecessary. In general, the way to "disallow" a constructor is to make it private:

class RadiationDescriber {

   // At the time of this writing (Aug 2023), there are only static usages of this type, so the constructor is private.  If state is ever 
   // needed, feel free to change this.  See https://github.com/phetsims/greenhouse-effect/issues/339.
  private constructor() {}