Draft: Add automatic_title column and bulk title update method

What does this MR do and why?

Part 2/3 of #343621 (closed)

None of the changes in this MR are user-facing. This MR contains the changes that have been split off from !75527 (closed) to reduce its MR size.

1. Adds automatic_title column to sprints table.

   • This column will NOT be used immediately in this MR.
   • The column indicates whether the title attribute of a sprints record should be automatically updated based on the sequence attribute or not.

2. Updates the spec for Iteration model (backed by sprints table) to ensure the introduction of automatic_title column does not affect the existing features.

3. Creates a new class method update_iteration_titles for Cadence model.

   • Again this class method will NOT be used but merely added in this MR.
   • The method will be used to update the titles of the iterations belonging to a cadence using sequences column.

Migration output

UP

== 20211216081351 AddAutomaticTitleColumnToSprintsTable: migrating ============
-- add_column(:sprints, :automatic_title, :boolean, {:default=>false})
   -> 0.0022s
== 20211216081351 AddAutomaticTitleColumnToSprintsTable: migrated (0.0022s) ===

Down

== 20211216081351 AddAutomaticTitleColumnToSprintsTable: reverting ============
-- remove_column(:sprints, :automatic_title, :boolean, {:default=>false})
   -> 0.0016s
== 20211216081351 AddAutomaticTitleColumnToSprintsTable: reverted (0.0081s) ===

MR acceptance checklist

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