Remove go-ssz entirely from prysm (#8257)

* Add DepositSigningData

* gaz

* Add to ssz tests

* Rename to DepositMessage

* Remove deprecated comment

* Remove return

* Fixes from review

* Fixes

* Remove some of gossz

* Remove go-ssz entirely

* Remove unneeded file

* Fix runtime with ssztypes

* Add back ssz files

* Fix formatting

* tidy

* Remove go-ssz from static

* tidy again

* Add tests

* Change to sig

* Fix test

* fx

* Fix visiblity

* Revert "Remove unneeded file"

This reverts commit d66fcda929.

Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>
Co-authored-by: Preston Van Loon <preston@prysmaticlabs.com>
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

DEPENDENCIES.md

@@ -34,7 +34,6 @@ also be updated and checked in as frequently.
 
 ```bash
 ./scripts/update-go-pbs.sh
-./scripts/update-go-ssz.sh
 ```
 
 *Recommendation: Use go build only for local development and use bazel build for production.*