fix(table-explorer): opening table with over 17 mln records gives _agg timeout error

[dtroelofsprins]

What version of EMX2 are you using (see footer)
v11.8.0

Describe the bug
Tables with large amounts of data like for example the Samples table on https://palga-emx2.molgenis.net cannot be opened using the table explorer. The following error message is shown:
Exception while fetching data (/Samples_agg) : SQL [select to_jsonb(item) from (select (select to_jsonb(item) from (select count(*) as "count" from (select * from "PODB"."Samples" as "gql_Samples_filter") as "gql_Samples") as "item") as "Samples_agg") as "item"]; ERROR: canceling statement due to user request

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://palga-emx2.molgenis.net'
2. Login (pwd can be found in the Vault)
3. Click on 'PODB'
4. Open Samples table
5. See error

Expected behaviour
Opening the table using the table explorer should work fine in case of large amounts of data. Also the aggregates function should work.

Additional context
In the end over 54 mln will be uploaded in this table, that should also work