Combine lesser used tags into more used tags

I noticed a problem where there’s Universal-Render-Pipeline which has only 340 posts, and URP which has 6633 posts.

These should be merged, and there’s multiple examples of stuff like this. Like Shader-Graph , com_unity_shadergraph , Graphics-Shader-Graph which can all be extremely confusing and should be merged.

No wait, oh weird, they are combined, just URP auto converts to Universal-Render-Pipeline after you use or click it.