Performance Test Framework update: Add warning and error counts to the DataDog dashboard

Collect and report on the numbers and types of warnings and errors reported during the performance test runs. Display the results in the DataDog CICD Performance dashboard. This enhancement was suggested by @algorandskiy .

Look at telemetry log and do a grep looking for error, warning, panic, and fail, and do summary counts.

In the runPerformanceTests.py script:

https://github.com/algorand/go-algorand-ci/blob/master/algod-perf-test/algonet/runPerformanceTests.py