Move pytest validations to its own directory

[nycrat]

(PART 1)

Description

• Moves pytest validations from simulated_tests/ to simulated_tests/validation/
• Moves cpp validation stuff from validation/ to cpp_validation/ (planned to be removed Remove C++ Simulated Test Fixtures  #2581)
• 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

[sauravbanna]

looks great, some good refactors ! i suggested a few more to reduce repetitive validations

[nycrat]

NOTE: If you look at the old validation logic for BallMovesFromRest, it does the same thing of checking if ball is within a radius to an initial position. That specific validation is not used anywhere else, so it has been removed in this PR

[nycrat]

This validation has been modified to include a robot_id parameter so that it can be a parent class for FriendlyReceivesBallSlow since they have lots of overlapped code

[nycrat]

@sauravbanna @Andrewyx @adrianchan787 I've reverted many changes in this PR so that only the changes relevant to moving the pytest validations are included which should make it much easier to review (pretty much just 1-5 line changes on each file). The one large change to refactor the FriendlyHasBallPossession and FriendlyReceivesBallSlow validations were made to reduce repeated code as Saurav requested.

Would appreciate a review on this one whenever you have time

lgtm