Make the clusterPlots notebook consistent with telemetry schema

[poojanilangekar]

Making the clusterPlots notebook consistent with execTimePlots and storagePlots notebooks.

[anjagruenheid]

For cluster plots, we only plot one experiment at a time, thus we only have one experiment id (EXPERIMENT_ID = "" instead of EXPERIMENT_ID = [""] like in the other notebooks), so you wouldn't actually need the for-loop here. The reason is that you're plotting different phases as different lines in the plot (vs different experiments as different lines in the plot which is what we do in the latency plots), thus you can actually only plot one experiment at a time. If you have any suggestions on how to visualize multiple experiments in the same plot, let me know! :)

[ashvina]

Hi @poojanilangekar, thanks for the PR and addressing my review comments.
For context, could you please add a short description of the actual issue you are observing, for e.g. in running the notebook or in extending the notebook for new functionality. It would help in ensuring it is not repeated.
Otherwise LGTM 👍