Update K8s versions tested in E2E

Add Kubernetes 1.26 and 1.28, remove end-of-life 1.22-1.25.

Signed-off-by: Daniel Farrell <dfarrell@redhat.com>

.github/workflows/consuming.yml

@@ -21,7 +21,8 @@ jobs:
         project: ['admiral', 'lighthouse', 'subctl', 'submariner', 'submariner-operator']
         deploytool: ['operator', 'helm']
         cabledriver: ['libreswan']
-        k8s_version: ['1.25']
+        # Run most tests against the latest K8s version
+        k8s_version: ['1.28']
         exclude:
           # Admiral E2E doesn't respect deploy-tool params, as it uses clusters without Submariner
           - project: admiral
@@ -35,11 +36,8 @@ jobs:
             cabledriver: wireguard
           # Test multiple K8s versions only in submariner-operator, balancing coverage and jobs
           - project: submariner-operator
-            k8s_version: '1.22'
-          - project: submariner-operator
-            k8s_version: '1.23'
-          - project: submariner-operator
-            k8s_version: '1.24'
+            # Bottom of supported K8s version range
+            k8s_version: '1.26'
     steps:
       - name: Check out the ${{ matrix.project }} repository
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11

Makefile.inc

@@ -12,7 +12,7 @@ TIMEOUT ?= 5m
 export AIR_GAPPED DEBUG_PRINT DUAL_STACK GLOBALNET LOAD_BALANCER PARALLEL PLUGIN PRELOAD_IMAGES PROVIDER SETTINGS TEST_ARGS TIMEOUT
 
 # Specific to `clusters`
-K8S_VERSION ?= 1.25
+K8S_VERSION ?= 1.28
 METALLB_VERSION ?= 0.13.5
 OLM_VERSION ?= v0.18.3
 export K8S_VERSION METALLB_VERSION OLM OLM_VERSION PROMETHEUS