Retailer Offers List & New Retailer Offer pages are blocked -> too many retailer

[pascalhugo]

For information, it's not the same problem with this ticket :
#27
In our case, it's because we have more than 7000 retailers.

Preconditions

Magento Version : CE 2.3.2

Module Retailer Offer Version : 1.5.1

Environment : Developer & Production

Third party modules :
Smile_ElasticSuite
Smile_Backend
Smile_Dataflow
Smile_Map
Smile_Offer
Smile_Retailer
Smile_Retailer_Offer
Smile_Seller
Smile_Store_Locator

Steps to reproduce

1. Create more than 5000 retailers
2. Go to Retailer Offers List page Or New Retailer Offer page

Expected result

1. The retailer offer page is loaded

Actual result

1. The retailer offer list&create page are blocked
   

Origin of the problem

The module load all retailers and send them in json.
After dom ready, the js get this list and create a select input with all the retailers like options, that's what creates the problem.