[6000.0] Fixed Custom URP Compile errors

[JessAtMeta]

Fixed up 6000.0 compilation; restored TraceRayAndQueryHit.hlsl as referenced from origin/master, wrapped packedMaterialData.isIndirectSupported with conditional compilation in InstanceCullingBatcher.cs, updated constants / keyword usage in ShaderScriptableStripperTests.cs

Checklist for PR maker

• Have you added a backport label (if needed)? For example, the need-backport-* label. After you backport the PR, the label changes to backported-*.
• Have you updated the changelog? Each package has a CHANGELOG.md file.
• Have you updated or added the documentation for your PR? When you add a new feature, change a property name, or change the behavior of a feature, it's best practice to include related documentation changes in the same PR. If you do add documentation, make sure to add the relevant Graphics Docs team member as a reviewer of the PR. If you are not sure which person to add, see the Docs team contacts sheet.
• Have you added a graphic test for your PR (if needed)? When you add a new feature, or discover a bug that tests don't cover, please add a graphic test.

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Purpose of this PR

Users were getting compile errors when opening projects including the following packages:

com.unity.render-pipelines.core@git+https://github.com/Oculus-VR/Unity-Graphics.git?path=/Packages/com.unity.render-pipelines.core#6000.0/oculus-app-spacewarp
com.unity.render-pipelines.universal@git+https://github.com/Oculus-VR/Unity-Graphics.git?path=/Packages/com.unity.render-pipelines.universal#6000.0/oculus-app-spacewarp 
com.unity.shadergraph@git+https://github.com/Oculus-VR/Unity-Graphics.git?path=/Packages/com.unity.shadergraph#6000.0/oculus-app-spacewarp

The console should be clear of errors when loading these packages.

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Testing status

Creating a project and including the above packages should no longer result in an error. To test from this fork instead, use:

com.unity.render-pipelines.core@git+https://github.com/JessAtMeta/Unity-Graphics.git?path=/Packages/com.unity.render-pipelines.core#6000.0/asw-fix
com.unity.render-pipelines.universal@git+https://github.com/JessAtMeta/Unity-Graphics.git?path=/Packages/com.unity.render-pipelines.universal#6000.0/asw-fix
com.unity.shadergraph@git+https://github.com/JessAtMeta/Unity-Graphics.git?path=/Packages/com.unity.shadergraph#6000.0/asw-fix

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Comments to reviewers

This should merge into the Oculus-VR/UnityGraphics fork of Unity's graphics mono-repo