New Client/Cluster reprs add TOC items in Jupyterlab
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bug
- Dominant language
- Python
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Description
**What happened**:
The new html reprs for `Client` and `Cluster` objects added in #4857 look super nice, but they also add items in Jupyterlab's TOC:

**What you expected to happen**:
Client/cluster repr headers not showing up in TOC, unless it is intentional?
**Environment**:
- Jupyterlab Version 3.0.16
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