Add logging on MSC4108 DELETE request (#5140)

Just noticed these requests aren't logged,
which makes debugging difficult.
This is very drive-by, done in the web editor.

Co-authored-by: R Midhun Suresh <hi@midhun.dev>

src/rendezvous/transports/MSC4108RendezvousSession.ts

@@ -262,7 +262,9 @@ export class MSC4108RendezvousSession {
 
         if (!this.url) return;
         try {
-            await this.fetch(this.url, { method: Method.Delete });
+            const method = Method.Delete;
+            logger.info(`=> ${method} ${this.url}`);
+            await this.fetch(this.url, { method });
         } catch (e) {
             logger.warn(e);
         }