Static Resource Variants

[HexaField]

Summary

Introduces a new table static_resource_variants which acts as a more general implementation of the now removed LODx_url & LODx_metadata columns

File upload now supports multiple files in the same request, as well as an option to upload them as variants, which adds them all to one static resource entry, with a variant entry associated for each variant, rather than all as separate static resources.

This allows the engine to opt for different versions of resources based on various heuristics for all media & model assets.

Also fixes problems when CLONE_STATIC_RESOURCES is disabled

References

closes #insert number here

Checklist

• If this PR is still a WIP, convert to a draft
• When this PR is ready, mark it as "Ready for review"
• ensure all checks pass
• Changes have been manually QA'd
• Changes reviewed by at least 2 approved reviewer

QA Steps

List any additional steps required to QA the changes of this PR, as well as any supplemental images or videos.