Remove debug dnf module list from konflux.Dockerfile [release-0.9]

[fbladilo]

Summary

• Remove RUN dnf module list from konflux.Dockerfile runtime stage on release-0.9

Motivation

MTA 8.1 rebases the runtime stage onto base-rhel9 (UBI minimal / microdnf). microdnf does not support the dnf module list subcommand, so Konflux PLR build-images fails:

error: Unknown subcommand: 'list'
Error: building at STEP "RUN . /cachi2/cachi2.env &&     dnf module list": exit status 1

The line was debug-only and is not needed for production builds. Same fix as #16 on main (merged for MTA 8.2).

Related:

• ART-21508: Introduce base-rhel9 base image [mta-8.1] openshift-eng/ocp-build-data#11595 (MTA 8.1 base-rhel9 migration)
• ART-21509: Introduce base-rhel9 base image [mta-8.2] openshift-eng/ocp-build-data#11596 (MTA 8.2 base-rhel9 migration, merged)

Test plan

• Merge and forward commit to openshift-priv release-0.9
• Re-run layered-products for mta-jdtls-server-base on mta-8.1 with DOOZER_DATA_GITREF=mta-8.1-base-rhel9

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