Making maxTransactionGroupsExceeded false by default (#150458)

Relates to #146648.

`maxTransactionGroupsExceeded` is currently `true` by default which is
causing a flickering in transactions page specifically for the table,
where we can see the callout for some milliseconds and then, after
getting results from endpoint, disappears.

### before this change


https://user-images.githubusercontent.com/1313018/217316916-e6434f4a-c4e6-4e12-ba2b-5f5ab0011984.mov

x-pack/plugins/apm/public/components/shared/transactions_table/index.tsx

@@ -49,7 +49,7 @@ const INITIAL_STATE: InitialState = {
   requestId: '',
   mainStatisticsData: {
     transactionGroups: [],
-    maxTransactionGroupsExceeded: true,
+    maxTransactionGroupsExceeded: false,
     transactionOverflowCount: 0,
     transactionGroupsTotalItems: 0,
   },