Changing "Due dates" do not create system notes

Problem

Due dates do not set system notes. With the increased importance of due dates when we introduce gitlab-ee~2466263 we will need a history to see who changed a due date, similar to milestones.

Proposal

Introduce a system note similar to:

Possible iteration:

Show in the system note if there was already a due date set, from which due date it was changed to which:

similar to https://gitlab.com/gitlab-org/gitlab-ee/issues/3405 and https://gitlab.com/gitlab-org/gitlab-ee/issues/3406

marked this issue as related to gitlab-ee#3405

marked this issue as related to gitlab-ee#3406

marked this issue as related to gitlab-ee#1481

@dimitrieh Should this one be moved to CE? CE would benefit from additional notes for the changing of the due date

assigned to @dimitrieh

added gitlab-ee~2024186 label

removed assignee

@markglenfletcher you are totally right, changing!

cc: @victorwu

changed milestone to %Next 2-3 months

added feature proposal label