fix(propagation): remove redundant warning messages

The propagation module logs some redundant warning messages that are
already printed, when necessary, during schema validation, with logic
that also checks the "old default" value. This commit removes the
unnecessary messages.

changelog/unreleased/kong/fix-propagation-remove-redundant-warnings.yml

@@ -0,0 +1,3 @@
+message: "**OpenTelemetry / Zipkin**: remove redundant deprecation warnings"
+type: bugfix
+scope: Plugin

kong/tracing/propagation/init.lua

@@ -33,11 +33,6 @@ local function get_plugin_params(config)
 
   if (config.default_header_type or null) ~= null then
     propagation_config.default_format = config.default_header_type
-
-    kong.log.warn(
-      "the default_header_type parameter is deprecated, please update your "
-      .. "configuration to use the propagation.default_format, "
-      .. "propagation.extract and propagation.inject options instead")
   end
 
   if (config.header_type or null) ~= null then
@@ -75,10 +70,6 @@ local function get_plugin_params(config)
         config.header_type
       }
     end
-
-    kong.log.warn(
-      "the header_type parameter is deprecated, please update your "
-      .. "configuration to use propagation.extract and propagation.inject instead")
   end
 
   return propagation_config