Duplicated namespaces are not fixed by ESLint plugin

[atachh]

In case a node has two or more magic namespace comments, both the @tilework/mosaic/no-duplicate-namespaces and @tilework/mosaic/use-namespace ESLint rules are not working as expected.

Example flow:
Given this code (both namespaces are incorrect):

/** @namespace Hello/World */
/** @namespace Hello/World */
export const myFunction = () => 'hello world'; 

When the ESLint finished running, the actual output is:

/** @namespace PackageName/Valid/Namespace/myFunction */
/** @namespace Hello/World */
export const myFunction = () => 'hello world'; 

The invalid namespace is still present and neither of @tilework/mosaic/no-duplicate-namespaces or @tilework/mosaic/use-namespace ESLint rules treat this as an error.

Expected output:

/** @namespace PackageName/Valid/Namespace/myFunction */
export const myFunction = () => 'hello world'; 

Proposed solution:
ESLint rule @tilework/mosaic/no-duplicate-namespaces should throw an error if more than one namespace is present on a single node, and should remove one of them.