Fixed using the wrong directional light data for clouds and the definition of current Sun when the shadow pass is culled (case 1399000)

[anisunity]

https://fogbugz.unity3d.com/f/cases/1399000/
There used to be two issues, one the current sun was ill defined when the shadow pass was culling. The second one was that the sunColor was potentially picked from the wrong directionalLightData (unlikely but possible). This PR fixes both issues

Testing status
Issue doesn't repro on the user dataset anymore.

[github-actions]

Hi! This comment will help you figure out which jobs to run before merging your PR. The suggestions are dynamic based on what files you have changed.
Link to Yamato: https://unity-ci.cds.internal.unity3d.com/project/902/
Search for your PR branch using the search bar at the top, then add the following segment(s) to the end of the URL (you may need multiple tabs depending on how many packages you change)

HDRP
/jobDefinition/.yamato%2Fall-hdrp.yml%23PR_HDRP_trunk
With changes to HDRP packages, you should also run
/jobDefinition/.yamato%2Fall-lightmapping.yml%23PR_Lightmapping_trunk

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[remi-chapelain]

Tested with switching from three different sun casting shadows with color and intensity.

2229965bc28aeeb65fa781d6f2b4049f.mp4