fix(module:date-picker): resolve memory leaks

[arturovt]

PR Checklist

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

[x] Bugfix

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7113 (b18647f) into master (d9982e9) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7113      +/-   ##
==========================================
- Coverage   89.63%   89.61%   -0.02%     
==========================================
  Files         488      488              
  Lines       15873    15872       -1     
  Branches     2584     2584              
==========================================
- Hits        14227    14223       -4     
- Misses       1014     1015       +1     
- Partials      632      634       +2     

Impacted Files	Coverage Δ
components/date-picker/date-picker.component.ts	90.87% <100.00%> (-0.04%)	⬇️
components/time-picker/time-holder.ts	95.78% <0.00%> (-1.06%)	⬇️
components/tabs/tab-nav-bar.component.ts	85.10% <0.00%> (-0.71%)	⬇️

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[wenqi73]

LGTM