Fix two issues with unusual milestone workboard initialization orders
7bca452fad1b
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Description

Fix two issues with unusual milestone workboard initialization orders

Summary: Fixes T10316. Fixes T10311.

Test Plan:

Create a project, create a milestone, go back to the parent, go to the workboard. Previously, fatal. Now, prompts you to create workboard.
Create a project, create a milestone, create the parent workboard, put a task in the milestone's column, go to the milestone workboard. Previously, fatal. Now, prompts you to create workboard.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10311, T10316