fix(module:spin): make delay behave more accurately

[Airblader]

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 new behavior?

• delay is now also respected when the component is initialized
• delay is only considered when nzSpinning turns from false to true, but not vice versa

If you don't agree with either change let me know and I can update the PR.

Does this PR introduce a breaking change?

[ ] Yes
[X] No

fixes #5926
fixes #5928

[codecov]

Codecov Report

Merging #5930 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5930      +/-   ##
==========================================
- Coverage   90.02%   90.00%   -0.03%     
==========================================
  Files         463      463              
  Lines       13948    13947       -1     
  Branches     2202     2202              
==========================================
- Hits        12557    12553       -4     
- Misses        856      857       +1     
- Partials      535      537       +2     

Impacted Files	Coverage Δ
components/spin/spin.component.ts	100.00% <ø> (ø)
components/core/util/text-measure.ts	89.56% <0.00%> (-1.74%)	⬇️
components/time-picker/time-holder.ts	94.73% <0.00%> (-1.06%)	⬇️

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[Airblader]

Accidentally disabled most tests, will fix this in a bit.
Edit: Done.

[vthinkxie]

LGTM, good work @Airblader

[github-actions]

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