chore: Make the airgap script work with CI index images

[rm3l]

Description

This introduces a new '--ci-index' option, which, when set to 'true', will replace all references to the internal Red Hat registries with quay.io when extracting and rebuilding the catalog.

Which issue(s) does this PR fix or relate to

• Addendum to https://issues.redhat.com/browse/RHIDP-5230

PR acceptance criteria

• Tests
• Documentation

How to test changes / Special notes to the reviewer

Example usage:

.rhdh/scripts/prepare-restricted-environment.sh \
	--index-image quay.io/rhdh/iib:next-v4.18-x86_64 \
	--ci-index true \
	--filter-versions '*' \
	--to-registry registry.localhost:5000/my-ns

[openshift-ci]

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