fix(module:code-editor): dispose the event listener when the component is destroyed

[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] Bugfix

What is the current behavior?

Monaco's models are stored independently from the editor instance (inside the ModelService). So they also have to be disposed separately.

What is the new behavior?

The event listener is disposed when the component is destroyed.

Does this PR introduce a breaking change?

[x] No

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #6847 (782b61b) into master (6d43b6c) will decrease coverage by 0.01%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master    #6847      +/-   ##
==========================================
- Coverage   89.52%   89.50%   -0.02%     
==========================================
  Files         489      489              
  Lines       15799    15805       +6     
  Branches     2427     2428       +1     
==========================================
+ Hits        14144    14147       +3     
- Misses       1012     1016       +4     
+ Partials      643      642       -1     

Impacted Files	Coverage Δ
components/code-editor/code-editor.component.ts	14.75% <12.50%> (+0.09%)	⬆️
components/tabs/tab-nav-bar.component.ts	83.03% <0.00%> (+0.70%)	⬆️

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[hsuanxyz]

LGTM