[Runner Fixes]: Updated Docker Image to use Alpine & Fixed Stdout Reporting

[BethanyG]

Closes issue #67

• Changed Docker image to use python:3.11.5-alpine3.18
• Changed /bin/run.sh, /bin/run-in-docker.sh, and /bin/run-tests-in-docker.sh to use python:3.11.5-alpine3.18 python paths.
• Upgraded pytest-subtests to version 0.11
• Per this Discord thread as well as this long-standing GH issue 67, removed u character that denoted subtests from stdout (printed) content, and modified runner to parse and place subtest stdout with each subtest in the results.json, rather than with the parent test output field.
• Added the example-partial-failure-with-subtests-and-stdouttest to verify the fix for u removal and stdout placement.
• Updated/modified the following tests and results.json files to account for the use of Alpine/Python 3.11.5, pytest-subtests 0.11, and the new runner modifications:
  • test/example-has-stdout-and-tasks/example_has_stdout_and_tasks_test.py
  • test/example-has-stdout/example_has_stdout.py
  • test/example-has-stdout/example_has_stdout_test.py
  • test/example-all-fail-tasks-and-subtests/results.json
  • test/example-has-stdout-and-tasks/results.json
  • test/example-has-stdout-tasks-and-subtests/results.json
  • test/example-has-stdout/results.json
  • test/example-partial-failure-with-subtests-and-stdout/results.json
  • test/example-partial-failure-with-subtests/results.json
  • test/example-syntax-error/results.json

[BethanyG]

Intended to also change the CI to run the Python repo tests, but will do that in a separate PR.

[ErikSchierboom]

Great!

[BethanyG]

Crossing fingers 🤞🏽 and pushing the big, green button! 🌟