Completely remove coroutines

[StarrryNight]

Description

This PR resolves #2359 . It removes all dead code from the old play structure using coroutines. This includes removing functions like getNextTactic, getNextTacticWrapper etc. update Tactics is also converted to a a pure virtual function, and its declaration is removed in play_base.cpp.

In addition, docs related to coroutines are also removed. Although cpp tests use coroutines, they are also being removed in #3632.

Testing Done

All tests pass. Thunderscope runs like before.

Resolved Issues

#2359

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]

lgtm !

[Andrewyx]

Nice work!