[ts-angular]: add ts-ignore directives to avoid compilation errors (!10713) · Merge requests · OpenAPI Tools / openapi-generator

Created by: verokarhu

The unused imports don't pass stricter TS compiler settings.

Tested by using the modified template as an override in project.

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Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
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```
./mvnw clean package 
./bin/generate-samples.sh
./bin/utils/export_docs_generators.sh
```
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