Tweak few thresholds
Adjust thresholds to reduce flakiness https://10k.testbed.gitlab.net/-/grafana/d/jH6yoWVMz/gitlab-performance-sitespeed-results?orgId=1&from=now-30d&to=now&var-test_name=web_project_file_blame&var-test_name=web_project_file_entire_blame&var-test_name=web_project_merge_request_changes&var-test_name=web_project_merge_request_discussions