Provide "Initial Members" instead of default joining projects
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Description

Provide "Initial Members" instead of default joining projects

Summary:
Ref T10010. Instead of autojoining projects, provide "Initial Members: [___]" that the user can fill in.

This is only available in the web UI when creating a (non-milestone) project.

Test Plan:

Created a new project with no members.
Created a new project with some members.
Created a new milestone (no control).
Created a new project with myself as a member and an "Editable By: Project Members" policy, to verify this use case still works properly.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10010