[chore](github)Remove 'Build Broker' task from .asf.yaml

Removed 'Build Broker' from the list of tasks.

.asf.yaml

diff --git a/.asf.yaml b/.asf.yaml
index 70f2c88..320b109 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -57,7 +57,6 @@
           - vault_p0 (Doris Cloud Regression)
           - FE UT (Doris FE UT)
           - BE UT (Doris BE UT)
-          - Build Broker
           - Build Third Party Libraries (Linux)
           - Build Third Party Libraries (macOS)
           - Build Third Party Libraries (macOS-arm64)