[Bug]: GroupOnObservable fires OnComplete if the Source does

[dwcullop]

Describe the bug 🐞

The GroupOnObservable fires OnComplete as soon as the source fires it, which will prematurely close the stream (sometimes before any groups can actually be made).

Step to reproduce

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Reproduction repository

https://github.com/reactivemarbles/DynamicData/

Expected behavior

It shouldn't fire OnComplete until the source fires OnComplete and ALL Grouping Observables have fired their OnComplete because grouping changes could come in at any time before then.

Screenshots 🖼️

No response

IDE

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Operating system

No response

Version

No response

Device

No response

DynamicData Version

9.0.4

Additional information ℹ️

No response

[dwcullop]

Fixed via #938

[github-actions]

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