* op-e2e: revive original 4844 DA test
Co-authored-by: Roberto Bayardo <bayardo@alum.mit.edu>

* op-service: fix beacon API HTTP client encoding of query string, avoid malformatting due to path joining

* op-batcher: data-availability-type enum and generic flag

* op-e2e: eip4844 test improvements

* op-batcher,op-service: review fixes on 4844 api fix

* eth: Add tests of Beacon API response structs

* eth,sources,fakebeacon: Update Beacon API BlobSidecar format

* eth: Remove field BlobSidecar.BlockRoot

* eth: Fix BeaconBlockHeader json tag, test APIGetBlobSidecarsResponse

* eth: Simplify Beacon API types and tests

* op-service: fix bytes96 terminal stringer in op-service/eth/types.go

* op-service: fix comment lint

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Co-authored-by: Roberto Bayardo <bayardo@alum.mit.edu>
Co-authored-by: Sebastian Stammler <seb@oplabs.co>