BackendTLSPolicy conformance tests for observedGeneration bump

[snorwin]

What type of PR is this?

/kind test
/area conformance-test

What this PR does / why we need it:
Add a conformance test for BackendTLSPolicy to verify that the observedGeneration is correctly updated for all status conditions, similar to the GatewayClassObservedGenerationBump or HTTPRouteObservedGenerationBump test.

Which issue(s) this PR fixes:

N/A

Does this PR introduce a user-facing change?:

NONE

[snorwin]

/cc @kl52752

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[rikatz]

Isn't this a subset of BackendTLSPolicyMustHaveCondition?

[snorwin]

Not exactly, it doesn’t explicitly assert the observedGeneration bump, but I agree it’s implicitly covered in the BackendTLSPolicyMustHaveCondition since the results of ConditionsHaveLatestObservedGeneration is used as a retry condition.

[rikatz]

Thanks @snorwin I would do a quick run here but lgtm from my side.

I will wait @kl52752 to take a look as well

[kl52752]

Thanks for the PR, LGTM :)

[rikatz]

/lgtm
Thanks @snorwin, tested here against envoy-gateway, works fine. Checked the whole resource observedGeneration evolution vs the test, it reflects the expected

[snorwin]

/assign @arkodg

[robscott]

Thanks @snorwin!

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kl52752, rikatz, robscott, snorwin

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