The github action failed to post reports

From a recent run:

Run title_date=$(date +%Y-%m-%d)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 69480  100   296  100 69184    736   168k --:--:-- --:--:-- --:--:--  168k
{
  "message": "Validation Failed",
  "errors": [
    {
      "resource": "Issue",
      "code": "custom",
      "field": "body",
      "message": "body is too long (maximum is 65536 characters)"
    }
  ],
  "documentation_url": "https://docs.github.com/rest/reference/issues#create-an-issue"
}
100 69480  100   296  100 69184    736   168k --:--:-- --:--:-- --:--:--  168k

I am guessing that the recent debugger tests fallouts resulted in a super long report that couldn't be posted in one go due to rescritions of GitHub. We probably need to update the action so that it split different parts into replies in that case.

Start from the GitHub Action step that posts the generated report and reproduce the failure with a report containing the recent debugger test fallouts. Trace how the report is sent to GitHub, then verify that oversized reports are split into replies and each posted body stays within GitHub's 65,536-character limit.