Move pytest validations to its own directory

[nycrat]

(PART 1)

Description

• Moves pytest validations from simulated_tests/ to simulated_tests/pytest_validations/
• Creates RobotAtPosition, RobotAtOrientation, RobotAtAngularVelocity, DelayValidation for future tests
• Remove ball BallMovesFromRest and BallMovesForward in favour of using other existing validations

Testing Done

Resolved Issues

part of #2558

Length Justification and Key Files to Review

Review Checklist

It is the reviewers responsibility to also make sure every item here has been covered

• Function & Class comments: All function definitions (usually in the .h file) should have a javadoc style comment at the start of them. For examples, see the functions defined in thunderbots/software/geom. Similarly, all classes should have an associated Javadoc comment explaining the purpose of the class.
• Remove all commented out code
• Remove extra print statements: for example, those just used for testing
• Resolve all TODO's: All TODO (or similar) statements should either be completed or associated with a github issue