fix(archiver): swallow error when rollup contract not yet finalized on L1 (#22156)

## Motivation

Right after deployment, the archiver's L1 sync queries
`getProvenCheckpointNumber` at the finalized L1 block tag. But if the
rollup contract didn't exist yet at that L1 block, the call returns no
data and logs a noisy warning on every sync iteration.

## Approach

Swallow the "returned no data" error in `updateFinalizedCheckpoint`
since it's an expected transient condition. Other errors still log a
warning.

## Changes

- **archiver**: Silence the `ContractFunctionExecutionError` with
"returned no data" in `updateFinalizedCheckpoint`, which occurs when the
rollup contract is too new to exist at the finalized L1 block

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

yarn-project/archiver/src/modules/l1_synchronizer.ts

@@ -256,8 +256,11 @@ export class ArchiverL1Synchronizer implements Traceable {
           },
         );
       }
-    } catch (err) {
-      this.log.warn(`Failed to update finalized checkpoint: ${err}`);
+    } catch (err: any) {
+      // The rollup contract may not exist at the finalized L1 block right after deployment.
+      if (!err?.message?.includes('returned no data')) {
+        this.log.warn(`Failed to update finalized checkpoint: ${err}`);
+      }
     }
   }