[chore] move from DialContext to NewClient (open-telemetry#13663)

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#### Description

Use grpc.NewClient instead of grpc.DialContext

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Fixes open-telemetry#13632 

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#### Testing

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---------

Signed-off-by: sivchari <shibuuuu5@gmail.com>

Author: sivchari

config/configgrpc/configgrpc.go

@@ -310,8 +310,16 @@ func (cc *ClientConfig) ToClientConn(
 	if err != nil {
 		return nil, err
 	}
-	//nolint:staticcheck // SA1019 see https://github.com/open-telemetry/opentelemetry-collector/pull/11575
-	return grpc.DialContext(ctx, cc.sanitizedEndpoint(), grpcOpts...)
+	conn, err := grpc.NewClient(cc.sanitizedEndpoint(), grpcOpts...)
+	if err != nil {
+		return nil, err
+	}
+
+	// Initiate connection to match the previous behavior of DialContext
+	// This ensures the connection is established eagerly rather than lazily
+	conn.Connect()
+
+	return conn, nil
 }
 
 func (cc *ClientConfig) addHeadersIfAbsent(ctx context.Context) context.Context {