feat(workloads): align name of config tab to YAML (#4598)

In other places we use the name `YAML` for the config tab. This aligns
workloads with the other places to also use `YAML` as the name.

Signed-off-by: schogges <moritz.fleck@konghq.com>

Author: schogges

packages/kuma-gui/src/app/workloads/locales/en-us/index.yaml

@@ -8,7 +8,7 @@ workloads:
       title: "{name}"
       navigation:
         workload-detail-view: Overview
-        workload-config-view: Config
+        workload-config-view: YAML
       about:
         title: About this Workload
         labels: Labels