Disable auto-filling issues for cobalt-based benchmarks (#2200)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sebastienros <1165805+sebastienros@users.noreply.github.com>

Author: Copilot

build/regressions.config.yml

@@ -8,7 +8,7 @@ sources:
           - area-perf
       - exclude: drogon|fasthttp|actix|gin|express|node|netty|spring|vertx|ntex|Siryn
       - exclude: ConnectionClose
-      - exclude: '[aA]zure|Cloud|Idna'
+      - exclude: '[aA]zure|[cC]obalt|Cloud|Idna'
       - exclude: Arm\s80
     daysToLoad: 60
     stdevCount: 7