Work Item Detail Improvements [Phase 3] - Create flow for planning objects
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### Problem to solve
As part of the OKR rollout, we introduced inline creation for Objectives. This was due to not having a create page for work items and the tight timeline. This is a different pattern from Issues. We should bring the two experiences together.
#### Scope
- Solve for how users create new epics, issues, tasks, OKRs and KRs.
- Solve for creating from different locations - within a planning object, globally from the main nav, from a board or list page, etc.
#### Objective creation experience

#### Issue creation experience

### Proposal
There are a couple of options:
* Create a work item creation experience similar to issues with a dedicated view
* Change the issue creation experience to be inline like work items
* Provide the ability to choose inline or "full-page" creation for both issues and work items
* Single click "create type" to create type and automatically open newly created work item in a drawer. More details are in this comment https://gitlab.com/gitlab-org/gitlab/-/issues/387214#note_1229325558
* Another great idea I haven't thought of :smile_cat:
For reference, there are some initial sketches in the issue - https://gitlab.com/gitlab-org/gitlab/-/issues/385313+
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