[FIX][INTEGRATION] Bug fix in merging integration MR

* The integration branch name when a new MR is created actually contains
  the repository name, while the script that is performing the merging
of the branch was using the recipe name. Aligning the behaviour of the
two scripts.
* Handle GitLab exception when no MR pipeline is created.
* Insert Mediatek handling in pipeline retriggering function.

scripts/accept_layer_merge_request.py

@@ -27,6 +27,8 @@ def retrigger_bsp_pipelines(
         bsp_group = group_name + "/nxp"
     elif "rockchip" in ci_project:
         bsp_group = group_name + "/rockchip"
+    elif "mediatek" in ci_project:
+        bsp_group = group_name + "/mediatek"
     else:
         print("No valid BSP vendor found, retriggering all BSP projects")
         bsp_group = group_name
@@ -49,12 +51,15 @@ def retrigger_bsp_pipelines(
         # Retrigger pipeline execution for all open MRs
         for mr in open_mrs:
             print(f"Running pipeline for MR: {mr.title}")
-            pipeline = mr.pipelines.create()
-            if pipeline:
+            try:
+                pipeline = mr.pipelines.create()
                 print(f"Pipeline created with ID: {pipeline.id}")
-            else:
-                print("Pipeline creation failed.")
-                sys.exit(1)
+            except GitlabGetError as e:
+                sys.exit(
+                    "ERROR: could not trigger merge request pipeline for MR '%s': %s"
+                    % (mr.title, e)
+                )
+            
 
 def get_source_integration_requests(
     project, state=None, target_branch=None, commit=None
@@ -268,8 +273,8 @@ def main():
 
     except GitlabGetError as e:
         sys.exit("Could not get integration branch name for latest project MR: %s" % e)
-    
-    integration_branch_name = args.recipe_name + "/" + integration_branch_name
+
+    integration_branch_name = args.project.rsplit('/', 1)[-1] + "/" + integration_branch_name
 
     try:
         merge_request = get_merge_requests(