TEST/MINOR: e2e: remove unsupported versions from testing

Author: mjuraga

.gitlab-ci.yml

@@ -113,36 +113,18 @@ build:
     - merge_requests
     - branches
 
-HAProxy_2_1:
-  extends: .e2e
-  parallel:
-    matrix:
-      - TESTPART: ["1/2", "2/2"]
-        HAPROXY_VERSION: "2.1"
 HAProxy_2_2:
   extends: .e2e
   parallel:
     matrix:
       - TESTPART: ["1/2", "2/2"]
         HAPROXY_VERSION: "2.2"
-HAProxy_2_3:
-  extends: .e2e
-  parallel:
-    matrix:
-      - TESTPART: ["1/2", "2/2"]
-        HAPROXY_VERSION: "2.3"
 HAProxy_2_4:
   extends: .e2e
   parallel:
     matrix:
       - TESTPART: ["1/2", "2/2"]
         HAPROXY_VERSION: "2.4"
-HAProxy_2_5:
-  extends: .e2e
-  parallel:
-    matrix:
-      - TESTPART: ["1/2", "2/2"]
-        HAPROXY_VERSION: "2.5"
 HAProxy_2_6:
   extends: .e2e
   parallel: