Persistent failure of "arduino-stats" GitHub Actions workflow runs

[per1234]

Describe the problem

The "arduino-stats" GitHub Actions workflow was designed to periodically gather download statistics from Arduino's CDN and push them to Datadog.

🐛 On 2022-03-14, the runs of the "arduino-stats" GitHub Actions workflow began to fail:

Traceback (most recent call last):
  File "/home/runner/work/arduino-ide/arduino-ide/.github/tools/fetch_athena_stats.py", line 127, in <module>
    exec_id = execute(athena_client, query, DEST_S3_OUTPUT)
  File "/home/runner/work/arduino-ide/arduino-ide/.github/tools/fetch_athena_stats.py", line 27, in execute
    wait_for_query_execution_completion(client, execution_id)
  File "/home/runner/work/arduino-ide/arduino-ide/.github/tools/fetch_athena_stats.py", line 40, in wait_for_query_execution_completion
    raise BaseException(
BaseException: query failed or canceled: INVALID_FUNCTION_ARGUMENT: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "b "

Because there had not been any relevant change in the repository between the last successful run and the first failing run, it seems likely that some external change caused the breakage.

To reproduce

1. Open the workflow runs list for the "arduino-stats" workflow: https://github.com/arduino/arduino-ide/actions/workflows/arduino-stats.yaml
2. Note the status of the runs.

🐛 They have all failed since 2022-03-14

Expected behavior

All workflows in the repository to be useful and in a functional state.

Additional context

The same problem happened with the workflow in the Arduino CLI repository. Since that workflow was not ever working correctly (I don't have any idea whether the one in this repo ever did) and the lack of an investigation about that indicates that the stats are not of immediate importance, it was decided the best course of action was to simply remove the broken infrastructure from the repository rather than investing time into fixing something that isn't being used anyway: arduino/arduino-cli#1701

The companion "github-stats" workflow, although functional, was removed as not valuable on its own at the same time: arduino/arduino-cli#1702

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details