[DPER3] Separate user embeddings and ad embeddings in blob reorder
Summary:
Separate user embeddings and ad embeddings in blobsOrder. New order:
1. meta_net_def
2. preload_blobs
3. user_embeddings (embeddings in remote request only net)
4. ad_embeddings (embeddings in remote other net)
Add a field requestOnlyEmbeddings in meta_net_def to record user_embeddings.
This is for flash verification.
Test Plan:
buck test dper3/dper3_backend/delivery/tests:blob_reorder_test
Run a flow with canary package f211282476
Check the net: n326826, request_only_embeddings are recorded as expected
Reviewed By: ipiszy
Differential Revision: D23008305
fbshipit-source-id: 9360ba3d078f205832821005e8f151b8314f0cf2
