[milo] Add an (uncached) method to get console rows.

milo/buildsource/swarming/expectations/build-gerrit.json

 {
   "Summary": {
     "Label": "2d8d62f6be545b10",
     "Status": "Running",
     "Source": {
       "Label": "Task 2d8d62f6be545b10",
       "URL": "https://example.com/task?id=2d8d62f6be545b10\u0026show_raw=1\u0026wide_logs=true"
     },
     "MainLink": [
       {
@@ skipping 21 matching lines @@
   },
   "SourceStamp": {
     "AuthorName": "",
     "AuthorEmail": "",
     "CommitTime": "0001-01-01T00:00:00Z",
     "Repo": "",
     "Branch": "",
     "RequestRevision": null,
     "Revision": null,
     "Description": "",
-    "Title": "",
     "Changelist": {
       "Label": "Gerrit CL",
       "URL": "https://chromium-review.googlesource.com/c/513444/32"
     },
     "CommitURL": "",
     "File": null,
     "Source": ""
   },
   "Components": [
     {
@@ skipping 27 matching lines @@
       "GroupName": "recipe bootstrap",
       "Property": null
     },
     {
       "GroupName": "Main",
       "Property": null
     }
   ],
   "Blame": null
 }