Disable default notifications for production jobs

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: I0a79c7edd13c1e00bef461f3f4dae17a69786db1
diff --git a/mbed-tls-pr-merge.yaml b/mbed-tls-pr-merge.yaml
index 4a6566d..a9fd447 100644
--- a/mbed-tls-pr-merge.yaml
+++ b/mbed-tls-pr-merge.yaml
@@ -39,6 +39,9 @@
         discover-pr-forks-trust: permission
         discover-pr-origin: both
         head-filter-regex: '(?!PR-7959-merge$)PR-\d+-merge'
+        status-checks:
+          skip: true
+          skip-branch-source-notifications: true
         property-strategies:
           all-branches:
           - pipeline-branch-durability-override: performance-optimized