Fix(year dropdown options): Year dropdown scroll defaults to center of list

[SashaRepin2]

Description bug:
The scroll position of the year dropdown is not scrolled towards the currently selected year. The scroll position will always stay in the center.

Issues:
#3747
#3646

[martijnrusschen]

Looks like the checks aren't succeeding, can you check what's going on?

[SashaRepin2]

Hi @martijnrusschen, it was error with test. Object "yearDropdownInstance.dropdownRef.current" doesn't have property "children" in test. In new version for scroll detecting i use this property in logic.
For least changes and clean logic i've decided to fix logic in datepicker main code in condition in didMount

[codecov]

Codecov Report

Merging #3844 (11deb7a) into master (be27eb2) will decrease coverage by 0.06%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #3844      +/-   ##
==========================================
- Coverage   94.60%   94.55%   -0.06%     
==========================================
  Files          20       20              
  Lines        1651     1654       +3     
  Branches      390      393       +3     
==========================================
+ Hits         1562     1564       +2     
  Misses         26       26              
- Partials       63       64       +1     

Impacted Files	Coverage Δ
src/year_dropdown_options.jsx	98.07% <75.00%> (-1.93%)	⬇️

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