Add dart_skills_lint to devtools and configure it to run in the cli and in tests#9770

reidbaker wants to merge 6 commits intoflutter:masterflutter/devtools:masterfrom

reidbaker:r-add-dart-skills-lint-to-devtools-v1reidbaker/devtools:r-add-dart-skills-lint-to-devtools-v1Copy head branch name to clipboard