Add test for the `plan remove` command.

features/backup_plan_cli_delete.feature

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+Feature: Deleting a backup plan with the CLI
+
+  @fixture.injector
+  @fixture.in_memory_database
+  @fixture.cli
+  Scenario Outline: Deleting an existing backup plan with the CLI
+    Given the CLI arguments are "<arguments>"
+    When I run the CLI
+    Then the CLI executed successfully
+
+    Examples:
+      | arguments                                                  |
+      | plans add --label my_label --source /mnt -d /mnt2 -d /mnt3 |
+      | plans add --label label2   --source /mnt -d /mnt2 -d /mnt3 |
+
+
+  @fixture.injector
+  @fixture.in_memory_database
+  @fixture.seeds
+  @fixture.cli
+  Scenario Outline: Deleting an non-existing backup plan with the CLI
+    Given the CLI arguments are "<arguments>"
+    And I have a backup plan with id="<existing_backup_plan_id>"
+    When I run the CLI
+    Then the CLI executed with an error
+
+    Examples:
+      | arguments                                                | existing_backup_plan_id              | description                |
+      | plans remove one -i 8aa59e7e-dc75-459b-beb5-b710b39be583 | 8aa59e7e-dc75-459b-beb5-b710b39be583 | delete an existing plan    |
+      | plans remove one -i 8aa59e7e-dc75-459b-aeb5-b710b39be583 | 8aa59e7e-dc75-459b-beb5-b710b39be512 | delete a non-existing plan |
+
+