[feature] remove test containers after every run

[akhildevelops]

I :heart: the tool thanks for creating it.

I observed that test containers don't stop and removed after every completion of tests.

After a successful run:

🏃 Starting test(s)...

🧪 Starting 'android-cli' tests...
🧪 Executing scenarios for feature 'android-cli'...
⚠️ No scenario file found at '/workspaces/devcontainer-features/test/android-cli/scenarios.json'. Skipping...



  ================== TEST REPORT ==================
✅ Passed:      'android-cli'

I observe the test containers still run:

node ➜ /workspaces/devcontainer-features/test/color (main) $ docker ps
CONTAINER ID   IMAGE                                                         COMMAND                  CREATED         STATUS         PORTS     NAMES
32aa248c7dc0   vsc-1676027268210-864360691c93743c8b0c629ee643756c-features   "/bin/sh -c 'echo Co…"   9 seconds ago   Up 7 seconds             flamboyant_moore