Add DownloadWeatherDataScheduledTask.get_all campaign_id argument

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (17fbd5c) 95.57% compared to head (0116501) 95.57%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #172 +/- ## ======================================= Coverage 95.57% 95.57% ======================================= Files 38 38 Lines 2484 2486 +2 Branches 467 468 +1 ======================================= + Hits 2374 2376 +2 Misses 86 86 Partials 24 24 ``` | [Impacted Files](https://codecov.io/gh/BEMServer/bemserver-core/pull/172?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BEMServer) | Coverage Δ | | |---|---|---| | [...rver\_core/scheduled\_tasks/download\_weather\_data.py](https://codecov.io/gh/BEMServer/bemserver-core/pull/172?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BEMServer#diff-YmVtc2VydmVyX2NvcmUvc2NoZWR1bGVkX3Rhc2tzL2Rvd25sb2FkX3dlYXRoZXJfZGF0YS5weQ==) | `86.66% <100.00%> (+0.45%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BEMServer). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BEMServer)

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