* refactor failed_tests_reporter to use TS, no octokit
* update renovate config
* ensure that all kbn-test files are in ts project
* fix some type errors
* add some more tests
* [kbn-test/githubapi] cleanup and document
* collect log messages as strings instead of message objects
* ensure issue is open when updating body
* improve readability of getKibanaIssues
* expose axios helpers from dev-utils
* fix request params for fetching github issues and validate locally
* include a README for failed_tests_reporter
* improve axios error helpers
