ci(NODE-6749): make Atlas cluster prefix < 23 characters long (#4420)

Author: baileympearson

Diff for: .evergreen/config.in.yml

@@ -1239,7 +1239,7 @@ task_groups:
           binary: bash
           env:
             MONGODB_VERSION: "7.0"
-            CLUSTER_PREFIX: dbx-node-search-indexes
+            CLUSTER_PREFIX: dbx-node-search
           args:
             - ${DRIVERS_TOOLS}/.evergreen/atlas/setup-atlas-cluster.sh
       - command: expansions.update

Diff for: .evergreen/config.yml

@@ -3160,7 +3160,7 @@ task_groups:
           binary: bash
           env:
             MONGODB_VERSION: '7.0'
-            CLUSTER_PREFIX: dbx-node-search-indexes
+            CLUSTER_PREFIX: dbx-node-search
           args:
             - ${DRIVERS_TOOLS}/.evergreen/atlas/setup-atlas-cluster.sh
       - command: expansions.update