Resolve "Gitlab CI failing on test/Makefile test-python-dap target"

Rewrite of expect-dap.script to retry telnet to debugpy port if it isn't yet running, closes #185 (closed). Also, changed timeout in expect-dev-entrypoint.script from 5 seconds to 10 seconds to allow for slower runners that cannot start a container and run all commands in under 5 seconds.