Zero downtime upgrade automated test

[strekm]

Description

Implement automated test checking Istio upgrade. It should test zero downtime upgrade. Test should be implemented in GH Action. Test should follow #429 (consider not using api-gateway module). test should be mandatory for main and release (check upgrade test implementation).

ACs:

• GH Action testing zero downtime upgrade
• mandatory pipeline triggered on main and release at least (similar to upgrade test)
• documentation
• green test

Reasons

test automation

DoD:

• Create a follow-up issue.
  - [ ] Provide unit tests.
• Provide integration tests.
• Provide documentation.
• Test on a production-like environment.
  - [ ] Verify if the solution works for both open-source Kyma and SAP BTP, Kyma runtime.
• Check the outcome of all related pipelines.
  - [ ] Verify resource limits.
• As a PR reviewer, verify code coverage and evaluate if it is acceptable.
  - [ ] Create a release.
  - [ ] Add release notes and What's New notes for Kyma customers.

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