[Gpr_To_Absl_Logging] Replace gpr_log (#37472)

[Gpr_To_Absl_Logging] Replace gpr_log

Closes #37472

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37472 from tanvi-jagtap:trivial_fix 4da50ab389
PiperOrigin-RevId: 662969065

src/python/grpcio_observability/grpc_observability/observability_util.cc

@@ -127,9 +127,8 @@ void AwaitNextBatchLocked(std::unique_lock<std::mutex>& lock, int timeout_ms) {
 void AddCensusDataToBuffer(const CensusData& data) {
   std::unique_lock<std::mutex> lk(g_census_data_buffer_mutex);
   if (g_census_data_buffer->size() >= GetMaxExportBufferSize()) {
-    gpr_log(GPR_DEBUG,
-            "Reached maximum census data buffer size, discarding this "
-            "CensusData entry");
+    VLOG(2) << "Reached maximum census data buffer size, discarding this "
+               "CensusData entry";
   } else {
     g_census_data_buffer->push(data);
   }