Create backlog list with board factory

What does this MR do and why?

This MR modifies the factory for issue boards so a backlog list is created for each new board.

Given that new boards created with Boards::CreateService include the backlog and closed lists by default but the factory only created a closed lists, we had to manually create the backlog list in several tests (mainly feature tests).

By creating this list in the factory we can avoid having to create the list manually and prevents unexpected failures (Re: !124674 (comment 1455943959))

We may still have cases where the backlog list is not present because boards didn't use to include it by default, so the tests for these cases will now delete the list created by the factory.

How to set up and validate locally

These changes only affect the boards factory. To validate follow these steps:

1. Using master branch open the Rails console and verify that 2 lists are created with a board when using the Boards::CreateService:

Click to expand

[1] pry(main)> group, user = Group.first, User.first
[2] pry(main)> service_board = Boards::CreateService.new(group, user).execute.payload
[3] pry(main)> service_board.lists

=> [#<List:0x000000028419e930
  id: 43,
  board_id: 19,
  label_id: nil,
  list_type: "backlog",
  position: nil,
  created_at: Thu, 13 Jul 2023 09:38:54.218277000 UTC +00:00,
  updated_at: Thu, 13 Jul 2023 09:38:54.218277000 UTC +00:00,
  user_id: nil,
  milestone_id: nil,
  max_issue_count: 0,
  max_issue_weight: 0,
  limit_metric: nil,
  iteration_id: nil>,
 #<List:0x000000028432c5b8
  id: 44,
  board_id: 19,
  label_id: nil,
  list_type: "closed",
  position: nil,
  created_at: Thu, 13 Jul 2023 09:38:54.219652000 UTC +00:00,
  updated_at: Thu, 13 Jul 2023 09:38:54.219652000 UTC +00:00,
  user_id: nil,
  milestone_id: nil,
  max_issue_count: 0,
  max_issue_weight: 0,
  limit_metric: nil,
  iteration_id: nil>]

2. Verify that only 1 list is created when using the factory:

Click to expand

[1] pry(main)> group, user = Group.first, User.first
[2] pry(main)> factory_board = FactoryBot.create(:board, group: group)
[3] pry(main)> factory_board.lists
=> #<List:0x0000000284786cf8
  id: 45,
  board_id: 20,
  label_id: nil,
  list_type: "closed",
  position: nil,
  created_at: Thu, 13 Jul 2023 09:40:08.663592000 UTC +00:00,
  updated_at: Thu, 13 Jul 2023 09:40:08.663592000 UTC +00:00,
  user_id: nil,
  milestone_id: nil,
  max_issue_count: 0,
  max_issue_weight: 0,
  limit_metric: nil,
  iteration_id: nil>]

3. Checkout the egrieff-add-backlog-list-to-board-factories branch and verify that 2 list are created when using the factory:

Click to expand

[1] pry(main)> group, user = Group.first, User.first
[2] pry(main)> factory_board = FactoryBot.create(:board, group: group)
[3] pry(main)> factory_board.lists
=> [#<List:0x0000000165b15e48
  id: 46,
  board_id: 21,
  label_id: nil,
  list_type: "backlog",
  position: nil,
  created_at: Thu, 13 Jul 2023 09:42:25.481696000 UTC +00:00,
  updated_at: Thu, 13 Jul 2023 09:42:25.481696000 UTC +00:00,
  user_id: nil,
  milestone_id: nil,
  max_issue_count: 0,
  max_issue_weight: 0,
  limit_metric: nil,
  iteration_id: nil>,
 #<List:0x000000016689f118
  id: 47,
  board_id: 21,
  label_id: nil,
  list_type: "closed",
  position: nil,
  created_at: Thu, 13 Jul 2023 09:42:25.483997000 UTC +00:00,
  updated_at: Thu, 13 Jul 2023 09:42:25.483997000 UTC +00:00,
  user_id: nil,
  milestone_id: nil,
  max_issue_count: 0,
  max_issue_weight: 0,
  limit_metric: nil,
  iteration_id: nil>]

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.