[ShaderGraph][2021.2][Backport] Fix for 1365186 - correct direction transform from view to world space

[jessebarker]

Purpose of this PR

This PR fixes https://fogbugz.unity3d.com/f/cases/1365186/

Transform direction from view to world was effectively doing a position transform rather than direction. This change fixes that.

Testing status

Without these changes, transforming (direction) from world->view->world and subtracting the result from the original vector yields non-0 value in Z:

With these changes:

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Comments to reviewers

Notes for the reviewers you have assigned.

[github-actions]

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[jessebarker]

The draft reminder check/action is failing, but it looks like it is set up wrong (trying to do something on 'master'). Everything else is passing.