PI-2526 Remove repeated punctuation strings

to prevent model errors due to "too many tokens":
```
Input validation error: `inputs` must have less than 512 tokens Given: 566
```

caused by strings such as:
```
---------------------------------------------------------
Comment added by name on 01/02/2023 at 12:34
Report Edited: 01/02/2023 at 12:34
---------------------------------------------------------
Comment added by name on 01/02/2023 at 12:34
Report Edited: 01/02/2023 at 12:34
...
```

projects/person-search-index-from-delius/container/pipelines/contact/index/ingest-pipeline.tpl.json

@@ -1,6 +1,14 @@
 {
   "description": "Split text into chunks and generate embeddings",
   "processors": [
+    {
+      "gsub": {
+        "tag": "Remove any repeated non-alphanumeric strings. The pattern looks for 2 or more non-alphanumeric characters surrounded by whitespace.",
+        "field": "notes",
+        "pattern": "(^|\\s)[^\\w\\s]{2,}(\\s|$)",
+        "replacement": " "
+      }
+    },
     {
       "text_chunking": {
         "algorithm": {