Ensure free claim txs can be executed

[arnaubennassar]

Rationale

Why should this feature exist?

Right now we only accept one free tx per claim. The free claim is marked as used the moment the tx is added into the pool. Before doing so the tx gets pre-executed to ensure that it will succeed, but for some reason some claims got stucked. Some ideas why this could happen:

• Invalid nonce
• The tx fails when the sequencer actually executes it

What are the use-cases?

Don't freeze free claims if something goes wrong

Implementation

• Make sure the nonce is correct before marking the claim as used
• Remove the claim used check from DB if the tx fails