Fix create work item issues

What does this MR do and why?

Fix the following issues on create work item view(both /new route and modal view)

1. Assign yourself in work item assignees
2. Labels query firing the correct query in labels context and group context
3. Work items list view/epics list view having the correct props
4. Dates being set correctly

MR acceptance checklist

• Create objective from issues list
• New epic from super sidebar
• New epic from work list items app
• New epic from epics list app
• /new path in group context and project context both - http://127.0.0.1:3000/groups/flightjs/sub-group-1/-/work_items/new and http://127.0.0.1:3000/flightjs/Flight/-/work_items/new
• Work item edit view for dates and assign yourself

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Videos
Screen_Recording_2024-10-04_at_13.28.30
Screen_Recording_2024-10-04_at_13.27.21

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Create a new epic from super sidebar, work items list page and epics list page to see all the fields are set as expected
2. Create new work items from group context and project context , check if the labels, dates and assignees are set as expected
3. Create an objective from new issues list and confirm the expected behavior
4. Work item edit route to test for dates and assignees