Add separate CI job for UBI images

[xliuxu]

Describe the bug

Follow-up issue from #5764:

We can move the UBI build and sanity check tasks to kind_ubi.yml as the same does for the Ubuntu images.

Expected

The UBI builds and sanity check tasks should be moved out from the build job to avoid overheads.

Actual behavior

The UBI builds is included in build.yml, which is not needed.
The sanity check for ubi images will also be run as part of build.yml after #5764 gets merged.

Versions:

N/A