bump cluster version to 1.28 in e2e scripts

[izabelacg]

Changes

• specify cluster version to 1.28 in e2e test scripts

Fixes #1212

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (656a0c6) 80.98% compared to head (c06bf80) 80.98%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1213   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files          18       18           
  Lines        1499     1499           
=======================================
  Hits         1214     1214           
  Misses        223      223           
  Partials       62       62           

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[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, izabelacg

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[dprotaso]

/override "e2e tests (v1.28.x, quay.io/maistra-dev/proxyv2-ubi8:2.4-latest, tls)"

[knative-prow]

@dprotaso: Overrode contexts on behalf of dprotaso: e2e tests (v1.28.x, quay.io/maistra-dev/proxyv2-ubi8:2.4-latest, tls)

In response to this:

/override "e2e tests (v1.28.x, quay.io/maistra-dev/proxyv2-ubi8:2.4-latest, tls)"

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