FIX: hanging eda notebook

[martins0n]

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Proposed Changes

Add special tag for hanging cell skip-execution
https://nbconvert.readthedocs.io/en/latest/config_options.html

Closing issues

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[codecov-commenter]

Codecov Report

Merging #1027 (daf357b) into master (4dd3d7f) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1027      +/-   ##
==========================================
+ Coverage   86.11%   86.13%   +0.02%     
==========================================
  Files         162      162              
  Lines        8627     8627              
==========================================
+ Hits         7429     7431       +2     
+ Misses       1198     1196       -2     

Impacted Files	Coverage Δ
etna/auto/runner/utils.py	100.00% <0.00%> (+50.00%)	⬆️

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