fix(collapse): fix collapse animation (child height)

[Domainv]

Closes #5202

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• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

[codecov]

Codecov Report

Merging #5316 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5316   +/-   ##
============================================
  Coverage        51.04%   51.04%           
============================================
  Files                3        3           
  Lines               96       96           
  Branches            17       17           
============================================
  Hits                49       49           
  Misses              37       37           
  Partials            10       10

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[codecov]

Codecov Report

Merging #5316 into development will increase coverage by 0.5%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##           development    #5316     +/-   ##
==============================================
+ Coverage        51.04%   51.54%   +0.5%     
==============================================
  Files                3        3             
  Lines               96       97      +1     
  Branches            17       17             
==============================================
+ Hits                49       50      +1     
  Misses              37       37             
  Partials            10       10

Impacted Files	Coverage Δ
demo/src/polyfills.ts	100% <100%> (ø)	⬆️

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[ludmilanesvitiy]

Tested functionality: accordion inside accordion with animation, collapse inside an accordion, typeahead inside an accordion with animation - looks good. Fixed CY test and stackblitz example.