[DNS] Update DNS analytics limits for Free plan (#19934)

* Update DNS analytics limits for Free plan

* Revert change to historical data limit in free plans

Author: RebeccaTamachiro

src/content/plans/index.json

@@ -657,7 +657,7 @@
 				},
 				"maximum_duration": {
 					"title": "Maximum time interval",
-					"free": "2 days",
+					"free": "7 days",
 					"pro": "31 days",
 					"biz": "31 days",
 					"ent": "31 days"