Drop redhat cdn connection

[mcalmer]

What does this PR change?

Drop a never used tool to connect to RedHat CDN.
It was never used as it requires a lot of dependencies and we use the UI way to get the repositories.

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

• No tests: already covered

• DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

If you don't need a changelog check, please mark this checkbox:

• No changelog needed

If you uncheck the checkbox after the PR is created, you will need to re-run changelog_test (see below)

Re-run a test

If you need to re-run a test, please mark the related checkbox, it will be unchecked automatically once it has re-run:

• Re-run test "changelog_test"
• Re-run test "backend_unittests_pgsql"
• Re-run test "java_pgsql_tests"
• Re-run test "schema_migration_test_pgsql"
• Re-run test "susemanager_unittests"
• Re-run test "javascript_lint"
• Re-run test "spacecmd_unittests"

[github-actions]

Suggested tests to cover this Pull Request

• srv_handle_software_channels_with_ISS_v2
• srv_manage_channels_page
• srv_channels_add
• srv_sync_products
• srv_delete_channel_with_tool
• srv_menu
• srv_sync_channels
• srv_content_lifecycle
• srv_task_status_engine
• srv_first_settings
• srv_menu_filter
• srv_wait_for_reposync
• allcli_update_activationkeys
• srv_enable_sync_products
• srv_create_repository
• srv_delete_channel_from_ui
• srv_disable_local_repos_off
• srv_add_rocky8_repositories
• srv_channel_api
• srv_clone_channel_npn

[meaksh]

Let's give it a try. Thanks 👍