feat: show plugin download counts only and stop CI builds inflating them

drizzle/postgres/0071_drop_install_count_source.sql

@@ -0,0 +1 @@
+ALTER TABLE "plugin_install_counts" DROP COLUMN "source";

drizzle/postgres/meta/_journal.json

@@ -498,6 +498,13 @@
       "when": 1791550496661,
       "tag": "0070_drop_donation_modal",
       "breakpoints": true
+    },
+    {
+      "idx": 71,
+      "version": "7",
+      "when": 1791755800419,
+      "tag": "0071_drop_install_count_source",
+      "breakpoints": true
     }
   ]
 }