test(robot): Merge recurring job creation functions

Merged `create_snapshot_recurringjob_for_volume`, `create_backup_recurringjob_for_volume`,
and `create_recurringjob_for_volume` into a single function `create_recurringjob_for_volume`
to reduce redundancy and improve maintainability.

longhorn/longhorn#10711

Signed-off-by: Roger Yao <roger.yao@suse.com>

Author: roger-ryao

e2e/keywords/recurringjob.resource

@@ -13,9 +13,8 @@ Create ${job_task} recurringjob ${job_id}
     create_recurringjob    ${job_name}    ${job_task}    &{args}
 
 Create snapshot and backup recurringjob for volume ${volume_id}
-    ${volume_name} =   generate_name_with_suffix    volume    ${volume_id}
-    create_snapshot_recurringjob_for_volume    ${volume_name}
-    create_backup_recurringjob_for_volume    ${volume_name}
+    Create recurringjob for volume ${volume_id} with    task=snapshot
+    Create recurringjob for volume ${volume_id} with    task=backup
 
 Create recurringjob for volume ${volume_id} with
     [Arguments]    &{config}

e2e/libs/keywords/recurringjob_keywords.py

@@ -28,20 +28,6 @@ def create_recurringjob(self, job_name, task, groups="[]", cron="*/2 * * * *", c
         logging(f"Creating recurringjob {job_name}, task={task}, groups={groups}, cron={cron}, concurrency={concurrency}, labels={labels}")
         self.recurringjob.create(job_name, task=task, groups=groups, cron=cron, concurrency=concurrency, labels=labels)
 
-    def create_snapshot_recurringjob_for_volume(self, volume_name):
-        job_name = volume_name + '-snap'
-
-        logging(f'Creating snapshot recurringjob {job_name} for volume {volume_name}')
-        self.recurringjob.create(job_name, task="snapshot")
-        self.recurringjob.add_to_volume(job_name, volume_name)
-
-    def create_backup_recurringjob_for_volume(self, volume_name):
-        job_name = volume_name + '-bak'
-
-        logging(f'Creating backup recurringjob {job_name} for volume {volume_name}')
-        self.recurringjob.create(job_name, task="backup")
-        self.recurringjob.add_to_volume(job_name, volume_name)
-
     def create_recurringjob_for_volume(self, volume_name, task, cron="*/2 * * * *"):
         job_name = volume_name + '-' + task