Display the number of proofs in a batch from the created task

Description

Currently the alert sender just sends the number of repetitions of sent proofs. This pr changes this to fetch the number of proof submitters in the batch from the proofSubmitters parameter of the createNewTask function call. This parameters contains the addresses of each submitted proof therefore the number of submitters corresponds to the number of proofs in the batch.

To Test:

• start a local devnet
• execute the alert script via ./alerts/sender_with_alert.sh ./alerts/.env.devnet
  You should observe that the correct number of proofs in a batch is displayed now and observe that if a second senders proofs are included in the batch the number of proofs are displayed. Adding additional task senders should increase the batch size.

16 proofs submitted and verified. We sent 16 proofs. Spent amount: 0.000171417922653 ETH ($ 0.57) [ http://localhost:3000/batches/0x0a8dd28a8e7a38151a22b3f04315d17be3a583fdc5fc925d085084b4c8732b27 ]

Type of change

Please delete options that are not relevant.

• New feature

Checklist

• “Hotfix” to testnet, everything else to staging
• Linked to Github Issue
• This change depends on code or research by an external entity
  • Acknowledgements were updated to give credit
• Unit tests added
• This change requires new documentation.
  • Documentation has been added/updated.
• This change is an Optimization
  • Benchmarks added/run
• Has a known issue
  • Link to the open issue addressing it
• If your PR changes the Operator compatibility (Ex: Upgrade prover versions)
  • This PR adds compatibility for operator for both versions and do not change batcher/docs/examples
  • This PR updates batcher and docs/examples to the newer version. This requires the operator are already updated to be compatible