After upgrading a project, when the samples are installed, the Install Samples button is still present, and installing them a second time results in duplicated assemblies and errors

Steps to reproduce:

1. Open a project with the VFX package installed on the latest 6.2
2. Install the learning templates
3. Upgrade to the latest 6.3
4. Install the learning templates again

Actual results: The Install Learning Templates button is still present, installation is allowed, and identical assemblies are installed in different locations

Assembly with name 'Unity.RenderPipelines.Core.Samples.Editor' already exists (Assets/Samples/Scriptable Render Pipeline Core/17.3.0/Common/Scripts/Editor/Unity.RenderPipelines.Core.Samples.Editor.asmdef)

Assembly with name 'Unity.RenderPipelines.Core.Samples.Editor' already exists (Assets/Samples/Scriptable Render Pipeline Core/Common/Scripts/Editor/Unity.RenderPipelines.Core.Samples.Editor.asmdef)

Expected results: 

• It is detected whether the samples are installed or not, and if they are already installed, the button is not present until the Samples folder is deleted. 
• Or path is fixed and everything gets cleanly re-installed

Reproducible with versions: 6000.3, 6000.4, 6000.5

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): macOS

Notes:

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