remove tscv

[iKintosh]

IMPORTANT: Please do not create a Pull Request without creating an issue first.

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?

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Proposed Changes

Related Issue

Closing issues

Closes #294

[julia-shenshina]

update please

• example notebook markdowns and table of content
• remove tests/test_model_selection/test_... because we don't have model selection module anymore

[codecov-commenter]

Codecov Report

Merging #337 (6fef012) into master (ee5b747) will decrease coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
- Coverage   87.70%   87.41%   -0.29%     
==========================================
  Files          98       96       -2     
  Lines        4830     4696     -134     
==========================================
- Hits         4236     4105     -131     
+ Misses        594      591       -3     

Impacted Files	Coverage Δ
etna/models/sklearn.py	95.74% <0.00%> (-0.56%)	⬇️
etna/models/catboost.py	100.00% <0.00%> (ø)
etna/analysis/__init__.py	100.00% <0.00%> (ø)
etna/analysis/outliers/__init__.py	100.00% <0.00%> (ø)
etna/transforms/segment_encoder.py	100.00% <0.00%> (ø)
etna/pipeline/pipeline.py	99.45% <0.00%> (+0.01%)	⬆️
etna/transforms/outliers.py	98.82% <0.00%> (+0.01%)	⬆️
etna/analysis/outliers/density_outliers.py	97.82% <0.00%> (+0.09%)	⬆️

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