Gain sel tracker

[rcervinoucm]

Creation of a gain selection webmaker script to track the status of the process

[morcuended]

For formatting, I recommend installing the pre commit hook that does it automatically when committing changes.
Please, also reuse functions defined somewhere else to avoid duplication.

[morcuended]

thx @rcervinoucm, I left some more comments

[morcuended]

Please also add small tests to ensure the script at least runs. Something like:

def test_gain_selection_webmaker(
    run_summary,
    merged_run_summary,
    drs4_time_calibration_files,
    systematic_correction_files,
    base_test_dir,
):


    output = sp.run(
        ["gainsel_webmaker", "--test", "-d", "2020-01-17"],
        text=True,
        stdout=sp.PIPE,
        stderr=sp.PIPE,
    )
    assert output.returncode != 0

[morcuended]

also add script name to the entry points list of pyproject.toml so becomes executable