Test play improvements

[kasohrab]

Description

See issue below for description.

Associated Issue

Resolves #1896

Steps to test

Test Case 1

1. note the required format of the plays (see the plays set close to the top of gameplay node in its constructor).
2. go to testing tab in ui, add play in that format.
3. click the desired play in the top table, and hit run.
4. all of them will work (except lineup because it's broken rn)

I did not implement the next button. It would be easy to set up later though.
I also did not use the python local param server (I commented it out, as I think it's overengineering for now, but it could be important later)
Later we can easily just at launch populate all valid plays into the selected plays list.

Also this pr deletes some unused ui stuff.
But at this point because it is functional, this pr is closed to new features.

Expected result: can change test play at runtime

Someone should double check trying to run invalid formats, non-existent plays, etc.. The code should handle all those cases.

Also you can use ros2 param set /gameplay_node test_play formatted_name

[kfu02]

Once #1898 is merged, could you merge in ros2? I can't test this on my pip=22.1 machine :(

Also, I would really strongly prefer there to be a list of checkbox options to select valid plays, since we have that list already. Typing in the same play on every restart of the UI will be a pain when developing new gameplay features.

Not sure what the best way to do this is--have both the ui code + GameplayNode read from some yaml? Publish a list of valid play strings as part of the msg on the test play topic from GN?

[kfu02]

Following up on the last review, here are some nits.

[p-nayak11]

The test tab works as intended. The keepaway play also does not work. Will need to check on it.