chore: remove FADE_CLASS_NAME_MAP and IMAGE_PREVIEW_MASK_CLASS_NAME

[Laffery]

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?

• 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: N/A

What is the new behavior?

移除此前标记将在 v19 移除的 API

Does this PR introduce a breaking change?

• Yes
• No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[HyperLife1119]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.91%. Comparing base (a65a32f) to head (58d821a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8912      +/-   ##
==========================================
- Coverage   91.92%   91.91%   -0.02%     
==========================================
  Files         554      554              
  Lines       19684    19682       -2     
  Branches     2936     2936              
==========================================
- Hits        18095    18091       -4     
- Misses       1264     1265       +1     
- Partials      325      326       +1     

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