Shader graphs are reimported at project shutdown

Steps to reproduce:

1. Create a new URP project
2. Add a build profile and set as current
3. Add graphics settings to the profile
4. Add a keyword declaration override into the shader build settings (the content of it does not matter)
5. Shutdown the editor

Actual results: 

Editor imports bunch of shader graph at each editor shutdown.

Expected results: 

Editor shuts down without extra import work.

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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