Fix notebooks not executable in CI

[vuillaut]

This is a continuation of #1091

I propose that all authors go through their notebook and see:

• if it can run - and if not update it
• if it can run with the test data available in the CI rather than a custom path
• delete it if completely obsolete

Here is a list of all notebooks and their original author. Please open a PR to fix your notebooks and check the boxes here.

• [ ] DL1b_to_DL2.ipynb: @SeiyaNozaki
• [ ] DL2_to_DL3.ipynb: @chaimain
• [ ] MC_DL2_to_IRF.ipynb: @chaimain
• [ ] apply_calibration.ipynb: @FrancaCassol
• [ ] apply_calibration_with_gain_selection.ipynb: @FrancaCassol
• [ ] calculate_calibration_coefficients.ipynb: @FrancaCassol
• [ ] calculate_pedestals.ipynb: @FrancaCassol
• [ ] calculate_sensitivity_eventio.ipynb: @rlopezcoto
• [ ] calculate_sensitivity_from_Crab.ipynb: @moralejo
• [ ] calculate_sensitivity_random_data.ipynb: @rlopezcoto
• [ ] cleaning_dl1_with_pedestal.ipynb: @pawel21
• [ ] data_quality.ipynb: @moralejo
• [ ] disp.ipynb: @vuillaut
• [ ] example_container.ipynb: @vuillaut
• [ ] explore_DL2.ipynb: @moralejo
• [ ] gain_estimation.ipynb: @Yukiho Kobayashi
• [ ] low_level_corrections.ipynb: @pawel21
• [ ] lst_sensitivity_pyirf.ipynb: @misabelber
• [ ] lstchain.ipynb: @misabelber
• [ ] mc_energy_distr.ipynb: @vuillaut
• [ ] plot_mc_muon_parameters.ipynb: @rlopezcoto
• [ ] plot_muon_data_mc_comparisons.ipynb: @rlopezcoto
• [ ] post_DL3_analysis.ipynb: @chaimain
• [ ] read_LST1_data.ipynb: @FrancaCassol
• [ ] read_and_plot_LST_Data.ipynb: @rlopezcoto
• [ ] rf-performance.ipynb: @rlopezcoto
• [ ] significance_calculation.ipynb: @rlopezcoto
• [ ] source_dependent_analysis.ipynb: @SeiyaNozaki
• [ ] step_by_step_dl0_to_dl1.ipynb: @rlopezcoto
• [ ] tests_on_impact_parameter.ipynb: @rlopezcoto
• [ ] time_calibration.ipynb: @pawel21

[morcuended]

thanks for the effort @vuillaut