The upload_package_index() call in both process-updates-redhat-10-*
files passed codename = "rhel9", which uploaded the redhat-10 index
to the rhel9 path. The companion update-package-index-redhat-10-*
files already use "rhel10" correctly.
Drop the R-version suffix from each image tag, add an explicit
R_VERSION env var per file, and invoke R via
/opt/R/${R_VERSION}/bin/R at every call site.
Also aligns ubuntu-2404 process-updates from R 4.4 to R 4.4.3,
matching the audit and rebuild counterparts.
