Implement an E2E Test verifying the expected labels on KymaCR

[c-pius]

Description

We currently don't have an E2E test that verifies that the watched-by label is present with the expected value kyma on the SKR KymaCR. We should either find an existing E2E test that can be extended with this, or we create an entire E2E test that is about metadata and verifies expected labels on multiple resources.

This also needs to consider that we sometimes already have such verification in E2E tests. E.g., #1913 includes a verification that managed-by label is present on all raw manifest resources and tests that those are removed once the module is unmanaged.

Ideally, we could even think about this as a "sanity check" E2E test where the checks can be re-used in the more detailed E2E tests.

Reasons

Some labels are significant to our implementations (e.g., the watched-by label). We need to make sure that those are consistent as expected.

Acceptance Criteria

• watched-by label verified in E2E tests
• TODO: discuss what further labels we would want to address

Feature Testing

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Testing approach

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Attachments

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