Speed up adding new child items by keeping the form open

Release notes

We've streamlined the process of creating child items by keeping the form open after each submission, making it easier to add multiple entries without extra clicks. This update saves you time and ensures a smoother workflow when managing your tasks.

Summary

When we add a new child item to a work item via the web interface, the form to add a name and related namespace for the new item closes and resets each time it is submitted.

Previously, the form stayed open and reset in a way that made it easy to add several new child items one after the other.

We mistakenly removed this feature in this MR(see discussion for context. We should be able to revert these changes without much difficulty to regain the intended behaviour.

Original description

Last year we made an improvement to legacy epics to quickly create multiple sub-issues by keeping the form open and keep the last selected project.

Can we bring this back? :)

Recordings of current behaviour

Previous	Current
Screen_Recording_2024-10-04_at_11.19.24	Screen_Recording_2024-10-04_at_11.20.45

Proposal

Using the diff in the MR, revert the changes that cause the form to close each time it's submitted.

Acceptance Criteria

• must keep the 'create work item' form 'open' after submitting it when creating a new child item.
• must remember the previously selected namespace (project/group) when adding several new child items one after the other.
• must move the focus back to the 'Title' textbox once the form has been submitted.