Dataframes render with excessive whitespace, and lose a majority of info

[Yoyokrazy]

Re: #237263

Currently after converting to a dataframe, variables are rendered with an excessive amount of whitespace, causing a lot of the information about them to be lost until hover. This is visible in both the notebook variables view and the cell execution inline values.

Perhaps there can be a generic approach to recognizing dataframes, and parsing them into a more readable single line format that can be shared between the two features.

[amunger]

The change could probably be tagged on where we already change the formatting options through pandas here: https://insiders.vscode.dev/github/microsoft/vscode-jupyter/blob/main/pythonFiles/vscode_datascience_helpers/getVariableInfo/vscodeGetVariablesForProvider.py#L454