Improve tests in Istio processing

[cnvergence]

Description
After refactoring, we need to improve our tests for processing authorization policies, request authentications, and virtual services.

Reasons
Increase code coverage.

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[kyma-bot]

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/lifecycle stale

[kyma-bot]

This issue or PR has been automatically marked as stale due to the lack of recent activity.
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This issue or PR has been automatically closed due to the lack of activity.
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/close

[kyma-bot]

@kyma-bot: Closing this issue.

In response to this:

This issue or PR has been automatically closed due to the lack of activity.
Thank you for your contributions.

This bot triages issues and PRs according to the following rules:

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/close

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