Fix issue causing asset dependencies to be ignored

[pbbastian]

Purpose of this PR

Import dependencies from the Generator class were being ignored due to re-assignment of list without out. I changed it to AddRange on the input list. Also bumped the importer version so that all Shader Graphs get re-imported and then have the dependencies setup correctly.

The issue was introduced in this PR: https://github.com/Unity-Technologies/ScriptableRenderPipeline/pull/4940

Testing status

Manual Tests

• Reproduced issue locally
• Verified fix locally

To reproduce the issue, you can make any change to com.unity.render-pipelines.universal/Editor/ShaderGraph/Targets/UniversalTarget.cs and notice that without the fix it does not cause a re-import of Shader Graphs, even though it registers itself as a source dependency.

You can also modify put a Debug.Log in here to see what ends up getting declared, and notice that without the fix it does not declare anything.
https://github.com/Unity-Technologies/Graphics/blob/master/com.unity.shadergraph/Editor/Importers/ShaderGraphImporter.cs#L168

[pbbastian]

@Unity-Technologies/gfx-qa-bellevue Any update on this?

[ghost]

I can not get the debug.log to print anything. I put it where you said, and then made a change to UniversalTarget.cs on your branch, and it did not cause the debug.log to happen. Am I missing something?

[ghost]

Changed the location I put the debug log. It doesn't reimport on master, but I've confirmed it does on this branch, when UniversalTarget.cs is changed. I'll approve.