[Scripting] Fix MonoPathRemapper warning triggers

[Planktomas]

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Purpose of this PR

This PR aims to proactively fix MonoPathRemapper warning triggers in Graphics packages. The remapper is engaged when we try to access files using virtual paths. With Unity 6.5 there was a utility method introduced with would devirtualize paths explicitly thus eliminating the need for MonoPathRemapper. This PR makes ShaderGraph and other SRP packages use the new path devirtualization when possible.

Warning triggers were caught using package verification jobs in Yamato.

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Testing status

Package verification jobs in Yamato