[grpc][Gpr_To_Absl_Logging] Making absl logging flags true

This PR is a follow up to this PR : 2c49416713

Flipping the flag to use absl logging instead of gpr_platform_log

PiperOrigin-RevId: 620134323

src/core/lib/config/config_vars.cc

@@ -95,7 +95,7 @@ ConfigVars::ConfigVars(const Overrides& overrides)
           FLAGS_grpc_not_use_system_ssl_roots, "GRPC_NOT_USE_SYSTEM_SSL_ROOTS",
           overrides.not_use_system_ssl_roots, false)),
       absl_logging_(LoadConfig(FLAGS_grpc_absl_logging, "GRPC_ABSL_LOGGING",
-                               overrides.absl_logging, false)),
+                               overrides.absl_logging, true)),
       dns_resolver_(LoadConfig(FLAGS_grpc_dns_resolver, "GRPC_DNS_RESOLVER",
                                overrides.dns_resolver, "")),
       verbosity_(LoadConfig(FLAGS_grpc_verbosity, "GRPC_VERBOSITY",

src/core/lib/config/config_vars.yaml

@@ -128,6 +128,6 @@
     ECDHE-RSA-AES256-GCM-SHA384"
 - name: absl_logging
   type: bool
-  default: false
+  default: true
   description:
     Use absl logging from within gpr_log.