[BD-46] docs: add Segment event for when the 'Show code' block is opened/closed

[PKulkoRaccoonGang]

Description

Issue #1937

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9ceae87) 91.04% compared to head (4dfd167) 91.04%.

❗ Current head 4dfd167 differs from pull request most recent head 67623d6. Consider uploading reports for the commit 67623d6 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2002   +/-   ##
=======================================
  Coverage   91.04%   91.04%           
=======================================
  Files         234      234           
  Lines        4122     4122           
  Branches      981      981           
=======================================
  Hits         3753     3753           
  Misses        362      362           
  Partials        7        7           

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[edx-semantic-release]

🎉 This PR is included in version 20.32.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[edx-semantic-release]

🎉 This PR is included in version 21.0.0-alpha.23 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

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