Collect identity provider EIDs server-side for the server-side auction #1567

User story

As a publisher, I want Trusted Server to collect EIDs from identity providers (ID5, LiveIntent, LiveRamp, ConnectID, UID2) server-side and store them with the Edge Cookie, so that the server-side auction receives the same IDs that client-side bidders see.

Follow-up to #1246, which found that Lockr's ID5 EID never reaches the SSAT auction because client-side collection only sees Prebid User ID module EIDs.

Acceptance criteria

• Provider EIDs are collected server-side and written to KV in a single page-load write (Collect server-side identity provider EIDs in a single page-load write #1487)
• Identity providers exist for ID5, LiveIntent, LiveRamp, ConnectID and UID2 (Add identity providers for ID5, LiveIntent, LiveRamp, ConnectID and UID2 #1488)
• Provider EIDs are mirrored to a first-party cookie, and pull sync runs as an identity provider (Mirror provider EIDs to a cookie and run pull sync as an identity provider #1489)
• Collected EIDs reach the server-side auction request

Affected area

Integrations (prebid, lockr, permutive, etc.)