perf(module:cascader): do not run change detections on non-handled keydown events

[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] Refactoring (no functional changes, no api changes)

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 #7060 (11595c3) into master (d45f0ab) will increase coverage by 0.01%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master    #7060      +/-   ##
==========================================
+ Coverage   89.57%   89.58%   +0.01%     
==========================================
  Files         488      488              
  Lines       15821    15830       +9     
  Branches     2440     2439       -1     
==========================================
+ Hits        14171    14182      +11     
  Misses       1009     1009              
+ Partials      641      639       -2     

Impacted Files	Coverage Δ
components/cascader/cascader.component.ts	94.76% <94.44%> (+0.14%)	⬆️
components/tabs/tab-nav-bar.component.ts	83.68% <0.00%> (+0.70%)	⬆️

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[simplejason]

LGTM