[Bug] Reset after initialization

[thibautklenke]

Description

As of right now, the reset (https://github.com/automl/SMAC3/blob/main/smac/main/smbo.py#L362) simply clears the runhistory and intensifier queue. However, if it is called again during the optimization, this renders the intensifier's working copy of the queue at https://github.com/automl/SMAC3/blob/main/smac/intensifier/intensifier.py#L242 stale, leading to an invalid remove at https://github.com/automl/SMAC3/blob/main/smac/intensifier/intensifier.py#L279 for example.

Further, because the runhistory is cleared, the model could not be re-trained. Rerun/resample initial design?