Prebid 6.10.0 doesn't send bidRequest param to floors custom fields

[JulieLorin]

Type of issue

This is a bug

Description

I am using custom schema fields alongside the priceFloors module.
When creating a custom schema field, we create a function that has a bidRequest and a bidResponse as parameters (cf documentation : https://docs.prebid.org/dev-docs/modules/floors.html#custom-schema-fields)
Since Prebid 6.10.0, the bidRequest param is null for bidResponse. (The associated bid request is not sent alongside the bidResponse).

Steps to reproduce

Run an auction with the priceFloors module enabled, some floors defined, with a custom schema.
For example, here is a custom field we use :

connector: (bidReq, bidRes) => bidReq.bidder ?? bidRes.bidderCode

If you have bid responses, you will see an error because bidReq is null.

Expected results

I would exepect to have the bidReq parameter to be filled, as it used to be.
It would be easy to fix it for this example, but we sometimes need the bid request (for example to retrieve a video context)

Other information

It seems to be linked to this commit :
https://github.com/prebid/Prebid.js/pull/7885/files#diff-52e7e567c667b4e2850bccc09785b9d48c3edb905487955df6437d7fc32eb216
The search for a "matchingBidRequest" has been removed