minor-perf: move ECDS factory acllback (#38347)

Commit Message: minor-perf: move ECDS factory
Additional Description:
Minor perf nit, move the ECDS factory callback, instead of copying it.

Risk Level: low
Testing: N/A
Docs Changes: N/A
Release Notes: N/A
Platform Specific Features: N/A

Signed-off-by: Adi Suissa-Peleg <[email protected]>

source/common/filter/config_discovery_impl.h

@@ -112,7 +112,7 @@ class DynamicFilterConfigProviderImpl : public DynamicFilterConfigProviderImplBa
                               Config::ConfigAppliedCb applied_on_all_threads) override {
     const absl::StatusOr<FactoryCb> config_or_error = instantiateFilterFactory(message);
     RETURN_IF_NOT_OK_REF(config_or_error.status());
-    update(config_or_error.value(), applied_on_all_threads);
+    update(std::move(config_or_error.value()), applied_on_all_threads);
     return absl::OkStatus();
   }
 
@@ -121,7 +121,7 @@ class DynamicFilterConfigProviderImpl : public DynamicFilterConfigProviderImplBa
     if (default_configuration_) {
       auto cb_or_error = instantiateFilterFactory(*default_configuration_);
       RETURN_IF_NOT_OK_REF(cb_or_error.status());
-      cb = cb_or_error.value();
+      cb = std::move(cb_or_error.value());
     }
     update(cb, applied_on_all_threads);
     return absl::OkStatus();