This PR does some cleanup around our Embed Shape.
It:
- removes used `doesResize` and `overridePermissions` props
- removes the no-longer-needed `tmpOldUrl` prop
- adds a `canUnmount` property to embed definitions, so that some embeds
can unmount when desired
### Change Type
- [x] `patch` — Bug Fix
### Test Plan
1. Create embed shapes
2. Migrate old data that includes embed shapes?
- [x] Unit Tests
### Release Notes
- [editor] Remove unused props for `TLEditorShape`
- [editor] Adds `canUnmount` property to embed definitions
b65aef5cf2