Function is_hook_rejection

Normalize any legal hook return value to a single "did it reject?" boolean.

Hooks in jssm may return any of the following to indicate success: true, undefined, or a complex result whose pass field is true. They may return any of the following to indicate rejection: false, or a complex result whose pass field is false. This helper collapses all of those shapes into one boolean so callers don't have to re-implement the matrix.

is_hook_rejection(true);            // false (pass)
is_hook_rejection(undefined);       // false (pass)
is_hook_rejection(false);           // true  (reject)
is_hook_rejection({ pass: true });  // false (pass)
is_hook_rejection({ pass: false }); // true  (reject)
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