[2.2.0] Checkmk Werk 16473 created: Support host & service labels in CSV exports again

Title: Support host & service labels in CSV exports again Class: fix Compatible: compat Component: multisite Date: 1707413153 Edition: cre Level: 1 Version: 2.2.0p22 In <a href="https://checkmk.com/werk/13729">Werk #13729</a> support for labels in CSV exports was removed (among other things). Instead, for affected columns a constant <code>"NOT_CSV_EXPORTABLE"</code> value was exported. This change reintroduces host & service labels as JSON serialized strings. This only relates to CSV exports, other formats are not affected. Sample export: C+: "host";"host_labels" "test";"{""cmk\/os_platform"": ""linux"", ""cmk\/os_family"": ""linux"", ""cmk\/check_mk_server"": ""yes"", ""cmk\/site"": ""test""}" "dummy";"{""my_label"": ""works""}" "nothing";"{}" C-: