Remove HashStf

[jfldde]

Description

• Remove HashStf which was only used for init_and_restart full node test
• Fixes get_l2_state_root return type which was failing serialization

Linked Issues

• Pre-req for Remove StfBlueprintTrait #1513

Testing

• Replaced with e2e full_node restart test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.1%. Comparing base (b610149) to head (2df5cdb).
Report is 1 commits behind head on nightly.

Additional details and impacted files

Files with missing lines	Coverage Δ
...vereign-sdk/full-node/sov-ledger-rpc/src/client.rs	100.0% <ø> (ø)

... and 6 files with indirect coverage changes

[eyusufatik]

one thing init_and_restart did different was that it tested if full node tried to run genesis in the second start. (bc it never synced to the sequencer). any chance you can capture the same in your test also?

[rakanalh]

LGTM

[yaziciahmet]

LGTM