Create/edit node pages should have a navigation bar that goes back to the right namespace

[shangyian]

Summary

This change makes it so that both the create and edit node pages will have a namespace navigation bar that goes back to the right namespace. For example:

Test Plan

• PR has an associated issue: Edit node page should have back navigation to namespace #1213
• make check passes
• make test shows 100% unit test coverage

Deployment Plan

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[agorajek]

Thanks!