Add config for running test suite against dummy plugin

Required to run the test suite against the dummy plugin. E.g. from the terminal in VSCode this can be done as follows:

pytest --capture=fd --count=1 -s /workspaces/pyswatch/src/swatch/test_plugin/testBoard.py --channels 1-5 --algo-test-config /workspaces/pyswatch/src/swatch/config/plugin-test/dummy-algo.yml --board-name herd-dummy1:3000  --processor x0  --fw-package http://emp-fwk.web.cern.ch/emp-fwk/fw/bitfiles/v0.6.8/serenity_vu9p_so2.tgz --input-data-file  /workspaces/pyswatch/src/swatch/config/input_data.txt --latency 0 --binary True --tolerate-command-warnings True --tolerate-monitoring-warnings True

cc @shilpi