[nrf noup] Disable some workflows for upmerge PRs

* Disable `Backwards compatibility check`
* Disable `Check for changes to data_model directory without a sha
update`

Signed-off-by: Adrian Gielniewski <adrian.gielniewski@nordicsemi.no>

Author: adigie

.github/workflows/check-data-model-directory-updates.yaml

@@ -16,6 +16,8 @@ name: Check for changes to data_model directory without a sha update
 
 on:
   pull_request:
+    branches:
+      - '!upmerge-*'
     paths:
       - "data_model/**"
 

.github/workflows/protocol_compatibility.yaml

@@ -15,6 +15,8 @@
 name: Backwards compatibility check
 on:
   pull_request:
+    branches:
+      - '!upmerge-*'
     paths:
       - "src/controller/data_model/controller-clusters.matter"