Keep a log of previous incidents that have been cleared

[danny-lloyd]

At the moment, once cloned you can search the git repo with git log -p -S <search term> e.g. git log -p -S sci-vm gives us:

...
+    "status": "resolved",
+    "affectedServices": "sci-vm-*",
+    "summary": "sci-vm hosts now submit to new cluster",
+    "date": "2025-03-31T09:00",
     "updates": [
       {
-        "date": "2025-03-14T17:00",
-        "details": "Date for closure of partitions on old cluster is now 28 March 2025."
...