Remove legacy pipelines

Author: unitysipu

.github/PULL_REQUEST_TEMPLATE.md

@@ -25,8 +25,6 @@ Please describe the tests that you ran to verify your changes. Please also provi
 - ROS–Unity communication: [e.g. Docker]
 
 ## Checklist
-- [ ] Ensured this PR is up-to-date with the `dev` branch
-- [ ] Created this PR to target the `dev` branch
 - [ ] Followed the style guidelines as described in the [Contribution Guidelines](https://github.com/Unity-Technologies/Unity-Robotics-Hub/blob/main/CONTRIBUTING.md)
 - [ ] Added tests that prove my fix is effective or that my feature works
 - [ ] Updated the [Changelog](https://github.com/Unity-Technologies/Unity-Robotics-Hub/blob/dev/CHANGELOG.md) and described changes in the [Unreleased section](https://github.com/Unity-Technologies/Unity-Robotics-Hub/blob/dev/CHANGELOG.md#unreleased)