Fix incorrect joint confidence colouring

[MaxPalmer-UH]

Change the target colour palette values for joint confidence targets in the render texture as they appear altered from the expected values

Summary

When investigating the Lumi work, it appeared that the joint values calculated in the render texture, which are used as the target pixel colours for counting / calculating joint visibility do not match the source values used to render the capsule hands. This is unexpected but several days of looking for potential causes failed to determine the issue. This code contains new target values, based on the pixel colours in the rendertexture and also some code that can be used to log out the colours, which is useful in checking if this is an issue that occurs across multiple systems/versions/platforms.

Contributor Tasks

• Create or edit test cases here
• 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.

Test Cycle

Link to the test cycle here.

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.

Related JIRA Issues

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[MattFiler]

Should this be disabled by default?

[rblenkinsopp]

Are we expecting to merge this/improve on this further, or is this dead now?

[rblenkinsopp]

Converting this PR back to a draft as it needs further work or closing.