This commit is an attempt to reduce the noise in PRs generated by the code coverage comment posted automatically by Codecov. It changes Codecov configuration to post a comment to a PR only if it changes the code coverage and it also removes reach graph, the diff image and the flags from the comment content. Leaving only a list of the files impacted by the PR. My initial plan was to leave in the comment content only a link to the full report, but I couldn't find a way to do that in the documentation (https://docs.codecov.io/docs/pull-request-comments).