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

* add dart skills lint test and yaml config with instructions for how to use

* Add ignore file for valid links that are triggering false positives

* resolve readme to correct location

* Copyright added to new files and issue linked in pubspec

* Add link to yaml configuration feature

* presubmit feedback

* Update tool/test/validate_skills_test.dart

Co-authored-by: Kenzie Davisson <43759233+kenzieschmoll@users.noreply.github.com>

* Update pubspec.yaml

Co-authored-by: Kenzie Davisson <43759233+kenzieschmoll@users.noreply.github.com>

* Fix one relative path issues, update version of dart_skills_lint

* remove the root dependency on dart_skills_lint

* Change todo format

* Remove double trailing line

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Co-authored-by: Kenzie Davisson <43759233+kenzieschmoll@users.noreply.github.com>