Add log level to workflow outputs

[lispandfound]

Small PR to add log levels to outputs of workflow stages. Essentially turning outputs from check-srf from

{"function": "check_srf", "id": "10f7fb13-02f2-481a-b671-19cc9462dce0", "realisation_ffp": "PosixPath('Darfield_Elliot_2012_Multi.json')", "srf_ffp": "PosixPath('test.srf')", "event": "called", "timestamp": "2025-02-25T03:02:39.595013Z"}
{"expected": 7.099999999999998, "actual": 7.100000006188335, "event": "SRF Magnitude", "timestamp": "2025-02-25T03:02:39.664837Z"}
{"function": "check_srf", "id": "10f7fb13-02f2-481a-b671-19cc9462dce0", "result": null, "event": "completed", "timestamp": "2025-02-25T03:02:39.665147Z"}

to outputs like

{"function": "check_srf", "id": "f26e16ec-a91a-4c79-be98-064b1c31444f", "realisation_ffp": "PosixPath('Darfield_Elliot_2012_Multi.json')", "srf_ffp": "PosixPath('test.srf')", "event": "called", "timestamp": "2025-02-25T03:16:16.286589Z", "level": "info"}
{"expected": 7.099999999999998, "actual": 7.100000006188335, "event": "SRF Magnitude", "timestamp": "2025-02-25T03:16:16.356692Z", "level": "info"}
{"function": "check_srf", "id": "f26e16ec-a91a-4c79-be98-064b1c31444f", "result": null, "event": "completed", "timestamp": "2025-02-25T03:16:16.357013Z", "level": "info"}

Note the addition of the level key to log outputs. The change is small but it means that tools like fblog that consume JSON logs can use the level for formatting and filtering.

[sungeunbae]

I will find it more useful if the level appears the first, but I wonder if it is possible to do so in the dictionary?

[lispandfound]

@sungeunbae I have no idea how to do that. I suspect structlog doesn't support this. However, I also don't think you need it because you aren't supposed to read these as plain text. Rather, you should pass these to other tools that understand json log formats. Here is an example of what I get when I pass the last log into fblog (a JSON CLI log viewer).

The idea of json formatted logs is a format-neutral logging style that can be ingested by other tools and formatted however you want. Thus, I doubt that structlog has any means to change the order of logged output in json format.