Fixed SetPerCameraShaderVariables function not working as expected

[thomas-zeng]

PR is second iteration of #6114
Shader Graph team had already approved the other iteration.

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Purpose of this PR

• This PR fixed an issue where _ScreenParams set by SetPerCameraShaderVariables are getting reset.

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Testing status

• Tested with local project that disaplays _ScreenParams.xy value on quad.
• ABV

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Comments to reviewers

• The SetupCameraProperties call will reset _ScreenParams field set by SetPerCameraShaderVariables such as _ScreenParams.
• I have moved the SetupCameraProperties after SetPerCameraShaderVariables to avoid being reset
• Previous PR here (gets booted out due to staging branch landing policy): Fixed SetPerCameraShaderVariables function not working as expected. #6114

[github-actions]

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