Mjp/make outline hands outline independent of normal scale

[MaxPalmer-UH]

Summary

Adds a stage when using outlines in the generic hand shader that normalises the length of the normal vector. This fixes issues with hand rigs that may be imported with normals that are inconsistent lengths.

Contributor Tasks

• Add a CHANGELOG entry for this change.
• Ensure documentation requirements are met e.g., public API is commented.
• Consider any licensing/other legal implications for this MR e.g. notices required by any new libraries.

Reviewer Tasks

• Code reviewed.
• Non-code assets e.g. Unity assets/scenes reviewed.
• All tests must be ran and cover all scenarios (If not, add new tests to the cycle and run them).
• Documentation has been reviewed.
• Approve with a comment of any additional tests run or any observations.

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