barcode logic: strip non-numeric characters from detected ASN string (#4379)

* legacy barcodes exist which still contain characters after the number. the current logic did not truncate them. instead, int() was called from the remaining string. this does not work in this case. it is therefore sufficient to continue processing numeric characters.

* lint

---------

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/documents/barcodes.py

@@ -1,4 +1,5 @@
 import logging
+import re
 import tempfile
 from dataclasses import dataclass
 from pathlib import Path
@@ -100,6 +101,9 @@ class BarcodeReader:
             # remove the prefix and remove whitespace
             asn_text = asn_text[len(settings.CONSUMER_ASN_BARCODE_PREFIX) :].strip()
 
+            # remove non-numeric parts of the remaining string
+            asn_text = re.sub("[^0-9]", "", asn_text)
+
             # now, try parsing the ASN number
             try:
                 asn = int(asn_text)