Enable lint rules for Promise handling to discourage misuse of them. (#2607)

* Enable lint rules for Promise handling to discourage misuse of them.
Squashed all of Hugh's commits into one.

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Co-authored-by: Hugh Nimmo-Smith <hughns@element.io>

src/otel/otel.ts

@@ -90,7 +90,9 @@ export class ElementCallOpenTelemetry {
 
   public dispose(): void {
     opentelemetry.trace.disable();
-    this._provider?.shutdown();
+    this._provider?.shutdown().catch((e) => {
+      logger.error("Failed to shutdown OpenTelemetry", e);
+    });
   }
 
   public get isOtlpEnabled(): boolean {