CI test for RL examples: Drive and VehicleFollowing

[Adaickalavan]

• Added CI test for RL Drive and VehicleFollowing examples, which tests the RL training process.
• Removed make build-all-scenarios command and only build necessary scenarios in CI to reduce test time.
• Note: The CI test for this PR will pass after Update RL examples: Drive and VehicleFollowing #2061 is merged.

[Gamenot]

I am not against it but is there any reason to change the name of the test?

[Adaickalavan]

With the addition of more jobs in the same workflow, following the original naming style, each of the job would have been suffixed with -linux. The suffix appeared a little repetitive, given the workflow's name of SMARTS CI Base Tests Linux which indicates it is for Linux. In short, the change was for aesthetics. This is how the test results look like now.

[Gamenot]

How long do these two tests take to run? We would want the total to be ~2 mins or less.

Otherwise, we will need to put it on some other schedule than always run.

[Adaickalavan]

• Currently the examples-rl test takes ~20 minutes
• By reducing the number of routes generated in the scenarios, the examples-rl test time may be reduced to ~12 minutes
• Previously the base-tests test took ~53 minutes to run when it attempted to build all scenarios.
• By only building the necessary scenarios, the base-tests now takes ~6 minutes.
• For a quick benefit, we may make another PR consisting of only building the necessary scenarios which will hasten the base-tests, while we figure how to best do CI for examples-rl test.

[Gamenot]

The test times appear to be ~18 minutes and 7 minutes. I think we should find a way to run these less frequently, maybe only against certain commit messages and master.