[META Support confirmations when navigating away from unsaved changes

[ohltyler]

There are several scenarios where we should warn users when exiting the edit page if there are unsaved changes. This includes:

• refreshing browser Warn users on browser refresh if unsaved changes #470
• navigating forward/back from browser. NOTE: testing with react router v5 Prompt in the WorkflowDetailHeader component seems to render multiple times. Seems like a known issue, and is historically buggy, and removed in v6. Further native js solutions may be the only path forward here.
• navigation within OSD (breadcrumbs, different applications, etc.). NOTE: have run into same issues described above ^
• navigation within plugin (clicking 'Close' button). NOTE: have run into same issues described above