Work item type selection based on namespace during creation in modal

When creating a new work item via the 'create work item' modal, we should present a list of available work item types based on the types available for the given 'namespace' (project or group).

We should use the Namespace.workItemTypes query to fetch the available options for the given namespace.

The selected work item types should be used when submitting the form.

For group level work items, default to 'epic'.

For project level work items, default to 'issue'.

Acceptance Criteria

• must display a listbox that contains the work item types available to the selected namespace (project or group).
• by default, for project level items, select 'issue'.
• by default, for group level items, select 'epic'.
• the selected work item type should be used when submitting the form and creating the new work item.