fix(prover): fail when fri prover job is not found (#2711)

## What ❔

Compressor should fail when a corresponding fri prover job is not found.
Unlikely to occur in real world but helps when manually populating DB
for debugging.

## Why ❔

This behaviour makes more sense

## Checklist

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- [x] PR title corresponds to the body of PR (we generate changelog
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- [ ] Tests for the changes have been added / updated.
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---------

Co-authored-by: EmilLuta <[email protected]>

prover/crates/bin/proof_fri_compressor/src/compressor.rs

@@ -136,7 +136,7 @@ impl JobProcessor for ProofCompressor {
             .get_scheduler_proof_job_id(l1_batch_number)
             .await
         else {
-            return Ok(None);
+            anyhow::bail!("Scheduler proof is missing from database for batch {l1_batch_number}");
         };
         tracing::info!(
             "Started proof compression for L1 batch: {:?}",