Remove nb metadata but keep output

[cpaniaguam]

This is needed for the check_notebooks workflow. Leaving cell output in for docs.

Changes to execution count and metadata cleanup:

• Removed unnecessary metadata tags from code cells to clean up the notebook. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22]

[review-notebook-app]

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[AlexanderFengler]

Same as with the ci workflow pr, need a bit of info to understand what exactly is happening.

Looks good in principle. @cpaniaguam

[AlexanderFengler]

lgtm. Might have to merge main once more to complete this for all new notebooks? @cpaniaguam

[cpaniaguam]

@AlexanderFengler I removed the cell metadata in docs/tutorials/tutorial_p_outlier_regression.ipynb but kept its output. We can merge this one now and update #674 with it.