Switch e2e tests to use Helm chart instead of all-in-one manifests

[programmer04]

Is there an existing issue for this?

• I have searched the existing issues

Problem Statement

E2E tests rely on manifests stored in test/e2e/manifests/ and generated with scripts/build-single-manifests.sh. Get rid of those manifests and related code/configuration, and replace them with the usage of Helm chart.

Proposed Solution

• manifests are removed, Helm chart is used

Additional information

Continuation of

• Deprecate the deploy manifests in favor of Helm #4712

Acceptance Criteria

• content of test/e2e/manifests is removed and all related code and configuration too
• e2e tests use Helm chart

[lahabana]

@programmer04 isn't there a chicken and egg problem here? As in we don't have a helm chart because the software isn't released yet?

Should we just set --set ingressController.image.tag (https://github.com/Kong/charts/blob/fd9deb6ee34d9b9ac4ab4be2188d4564d0b655e5/charts/kong/values.yaml#L535C1-L536C1) or maybe there's something I fundamentally miss on how e2e tests work?

[randmonkey]

IHAC when we updated the CRDs (bump gateway API version or update own CRDs), we will have to update helm charts before the release that can really compatible with these CRDs. This may make the charts unavailable.

[programmer04]

You're right @lahabana setting image explicitly is the way to go