Generic Analytics Module: default to fetch keepalive

[patmmccann]

Type of issue

Feature

Description

Keepalive is a useful option on the fetch calls. We'd like to default this on for the generic analytics module.

Prebid.js/modules/amxBidAdapter.js

Line 551 in d17c44b

fetch(POST_TRACKING_ENDPOINT, {

is ana example of importing the fetch method from ajax and it could be used similarly in place of

https://github.com/prebid/Prebid.js/blob/d17c44bc98b88423882b4befa8baf414780cecd3/modules/genericAnalyticsAdapter.js#L145C1-L146C1

[patmmccann]

#11475 is similar in nature