Stabilize license check related test.

[Mati365]

Suggested merge commit message (convention)

Tests: Stabilize license check related test. Closes #486

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Additional information

Fixes https://app.circleci.com/pipelines/github/ckeditor/ckeditor5-angular/845/workflows/4c9e77d9-5f91-40d9-9fe9-f2af9b466a1a/jobs/1708

Chrome 136.0.0.0 (Linux x86_64) ERROR
  An error was thrown in afterAll
  CKEditorError: invalid-license-key
  Read more: https://ckeditor.com/docs/ckeditor5/latest/support/error-codes.html#error-invalid-license-key
  error properties: Object({ context: undefined, data: undefined })
  CKEditorError: invalid-license-key
  Read more: https://ckeditor.com/docs/ckeditor5/latest/support/error-codes.html#error-invalid-license-key
      at apply (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@ckeditor/ckeditor5-core/dist/index.js:2489:15)
      at apply (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:2367:41)
      at _ZoneDelegate.invokeTask (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:402:31)
      at ProxyZoneSpec.onInvokeTask (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone-testing.js:304:39)
      at _ZoneDelegate.invokeTask (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:401:60)
      at Zone.runTask (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:173:47)
      at call (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:483:34)
      at apply (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:472:48)
      at data.args.<computed> (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:2347:32)

[coveralls]

Pull Request Test Coverage Report for Build 88b83e7f-dce2-4bb8-9d74-807d9290e20e

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 397adb2e-85be-4c97-a61b-55f5e77f1f51:	0.0%
Covered Lines:	163
Relevant Lines:	163

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💛 - Coveralls

[arkflpc]

Please create a ticket before merge.