Max/mixfetch concurrentcy tweak (#6539)

* Remove debug connect logging

* Add random suffix to addressmapping for concurrent outgoing requests to
same endpoint

* Comment + renaming + pulling apart of mapping key & URL.

* Add certs file + remove hardcoding + add certs script

* Add cleanbuild helper script

* Update DEVELOPERS.md

* Add cleanbuild script info to DEVELOPERS.md

* Remove notice about blocking on concurrent same endpoint reqs

.github/workflows/publish-sdk-npm.yml

@@ -36,6 +36,9 @@ jobs:
         with:
           go-version: "1.24.6"
 
+      - name: Update root CA certificate bundle
+        run: ./wasm/mix-fetch/go-mix-conn/scripts/update-root-certs.sh
+
       - name: Install dependencies
         run: yarn