[FIXED] valueCount for array mipmaps read from vsg::Data

[siystar]

Pull Request Template

Description

Added vsg::computeValueCount used in CopyAndReleaseImage / TransferTask to get the correct value count for layered, mipmapped image data.

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Tested converting 2D images to 2D image array.

Tested vsgvalidate array_data_mipmaps:

info: array_data_mipmaps test passed

Checklist:

• [ ] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [X] Any dependent changes have been merged and published in downstream modules