Drop k8s v1.28 from kind testing and update cluster version to 1.30 in e2e

[skonto]

Proposed Changes

• Similar to Drop k8s v1.27 from kind testing and update cluster version to 1.28 in e2e #14904
• Versions prior to 1.30 are in maintenance https://kubernetes.io/releases/, Knative does not support them when a cut is done (1.17 is coming soon):

We (the community) support the range of upstream minor Kubernetes versions that are Kubernetes community supported at the time of the cut. This excludes releases which have entered maintenance mode. Only the latest patch release of the minor version is tested for support. Support for versions prior to that are best effort, or by vendors.
Adoption of newer K8s minimum versions will also be on a best-effort basis. When a Kubernetes version is released it's availability in downstream distributions is often lagging. When these delays affect our planned min K8s version we'll update the version table below and make it known in the release's notes.

From a vendors pov (stable channels):

• OCP is on 1.30
• EKS on 1.31
• AKS on 1.31
• GKE on 1.30

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.49%. Comparing base (06281eb) to head (843cd52).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15655      +/-   ##
==========================================
- Coverage   83.54%   83.49%   -0.06%     
==========================================
  Files         219      219              
  Lines       17427    17427              
==========================================
- Hits        14560    14551       -9     
- Misses       2497     2503       +6     
- Partials      370      373       +3     

☔ View full report in Codecov by Sentry.
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[skonto]

Is it too expensive to test three versions? I could have updated to 1.32 but this was just released so we can upgraded later, wanted to move incrementally without skipping a version.

[ReToCode]

I think the idea is that we have a min version and for the the API compat-check the next one.

[skonto]

Ok at the time of the cut of 1.17 there will be 1.29 around so I will update that one (End of Life:2025-02-28).

[skonto]

Update: 1.29 enters maintenance in December will move to 1.30 as the minimum.

[skonto]

cc @dprotaso

[skonto]

As @ReToCode pointed out 1.17 is going to support 1.30 (https://github.com/knative/community/blob/main/mechanics/RELEASE-SCHEDULE.md) so I will remove 1.29.

[skonto]

We also need to update depds and k8s-minimum at the knative/pkg side. Will do a PR.

[skonto]

It seems we missed updating the minimum for 1.16.

[skonto]

/hold

[skonto]

knative/pkg#3124

[ReToCode]

/lgtm
/approve

/hold for the pkg one

[ReToCode]

I think the idea is that we have a min version and for the the API compat-check the next one.

[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ReToCode, skonto

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[skonto]

Do we need to test all three or two are good enough.

[dprotaso]

/hold cancel
/lgtm

let's add k8s 1.32 kind testing in a follow up