fix(module:select): prevent hidden options from being selected

[QichenZhu]

PR Checklist

Please check if your PR fulfills the following requirements:

• 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

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #4377

What is the new behavior?

Hidden options cannot be selected.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[netlify]

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Built with commit 0227d23

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[codecov]

Codecov Report

Merging #4382 into master will increase coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4382      +/-   ##
==========================================
+ Coverage    92.2%   92.31%   +0.11%     
==========================================
  Files         520      520              
  Lines       11039    11040       +1     
  Branches     1997     1997              
==========================================
+ Hits        10178    10192      +14     
+ Misses        429      419      -10     
+ Partials      432      429       -3

Impacted Files	Coverage Δ
components/select/nz-select.service.ts	86.22% <100%> (+2.63%)	⬆️
components/core/addon/string_template_outlet.ts	84% <0%> (+16%)	⬆️

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[vthinkxie]

Hi @QichenZhu
thanks a lot for your pr
could you add some test cases to pass the CI?

[vthinkxie]

LGTM