remove ubuntu-23 from test suite (#448)

Author: okankoAMZ

generator/resources/ec2_linux_test_matrix.json

@@ -21,17 +21,6 @@
     "binaryName": "amazon-cloudwatch-agent.deb",
     "family": "linux"
   },
-  {
-    "os": "ubuntu-23",
-    "username": "ubuntu",
-    "instanceType":"t3.medium",
-    "installAgentCommand": "go run ./install/install_agent.go deb",
-    "ami": "cloudwatch-agent-integration-test-ubuntu-23*",
-    "caCertPath": "/etc/ssl/certs/ca-certificates.crt",
-    "arc": "amd64",
-    "binaryName": "amazon-cloudwatch-agent.deb",
-    "family": "linux"
-  },
   {
     "os": "ubuntu-24",
     "username": "ubuntu",