perf(module:mention): do not run change detections on mousedown 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 #7094 (04961d1) into master (2f7c44d) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7094      +/-   ##
==========================================
+ Coverage   89.61%   89.66%   +0.05%     
==========================================
  Files         488      488              
  Lines       15873    15883      +10     
  Branches     2446     2446              
==========================================
+ Hits        14225    14242      +17     
+ Misses       1015     1007       -8     
- Partials      633      634       +1     

Impacted Files	Coverage Δ
components/mention/mention.component.ts	97.35% <100.00%> (+0.14%)	⬆️
components/core/util/text-measure.ts	89.47% <0.00%> (-1.76%)	⬇️
components/table/src/table-style.service.ts	94.82% <0.00%> (-1.73%)	⬇️
components/tabs/tab-nav-bar.component.ts	85.81% <0.00%> (+0.70%)	⬆️
...ts/table/src/table/table-inner-scroll.component.ts	81.42% <0.00%> (+4.28%)	⬆️
components/table/src/table/tbody.component.ts	100.00% <0.00%> (+11.11%)	⬆️
components/table/src/table/tr-measure.component.ts	100.00% <0.00%> (+13.04%)	⬆️

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[simplejason]

LGTM