fixup! Error handling when cancelling submission

Address comments

Author: jerbaroo

libs/opsqueue_python/python/opsqueue/exceptions.py

@@ -58,7 +58,7 @@ def __init__(
     def __str__(self) -> str:
         chunk_str = f"\n{self.chunk}"
         return f"""
-        Submission {self.submission.id} was not cancelled because:
+        Submission {self.submission.submission.id} was not cancelled because:
 
         {self.submission}
         {"" if self.chunk is None else chunk_str}

opsqueue/src/common/submission.rs

@@ -963,7 +963,7 @@ pub mod db {
 
                 tracing::info!("Deleted {n_submissions_completed} completed submissions (with {n_chunks_completed} chunks completed)");
                 tracing::info!("Deleted {n_submissions_failed} failed submissions (with {n_chunks_failed} chunks failed)");
-                tracing::info!("Deleted {n_submissions_cancelled} cancelled submissions (with {n_chunks_completed} chunks completed and {n_chunks_failed} chunks failed)");
+                tracing::info!("Deleted {n_submissions_cancelled} cancelled submissions");
                 Ok(())
             })
         })