Sync GPG properties on each build in CLM (bsc#1213689)

[cbbayburt]

Sync GPG fields on target repositories on build/promote in case the values have changed in the source after the last build.

Port of: https://github.com/SUSE/spacewalk/pull/22537

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_rename_hostname
• allcli_sanity
• allcli_update_activationkeys
• srv_monitoring
• srv_menu
• proxy_cobbler_pxeboot
• srv_content_lifecycle
• proxy_as_pod_basic_tests
• srv_add_rocky8_repositories
• proxy_branch_network
• srv_first_settings