Shrink version testing matrix (Azure#44695)

Author: alzimmermsft

sdk/core/version-overrides-matrix.json

@@ -20,17 +20,10 @@
     },
     "VersionOverride": [
         "jackson_2.10",
-        "jackson_2.11",
         "jackson_2.12",
-        "jackson_2.13",
-        "jackson_2.14",
         "jackson_2.15",
-        "jackson_2.16",
-        "jackson_2.17",
         "jackson_2.18",
         "reactor_2020",
-        "reactor_2022",
-        "reactor_2023",
         "reactor_2024"
     ]
   }