Check if processed data already exists in --production mode

[mflierm]

What does the code in this PR do / what does it improve?

The code checks in the runs database if the run that is being tried to process, has already been processed (i.e. bootstrax_status in ['done', 'processing', 'considering']). This avoids that the processing results in 'failed' (because there is no live_data available anymore).

Can you briefly describe how it works?

See above.

Can you give a minimal working example (or illustrate with a figure)?

Please include the following if applicable:

• Update the docstring(s)
• Update the documentation
• Tests to check the (new) code is working as desired.
• Does it solve one of the open issues on github?

Notes on testing

• Until the automated tests pass, please mark the PR as a draft.
• On the XENONnT fork we test with database access, on private forks there is no database access for security considerations.

[JoranAngevaare]

Thanks Maricke, I think this is very useful (I at least screwed this up a couple of times)! Looks good. Let's make sure we test it once just before making the next release - just to be sure

[coveralls]

Coverage increased (+0.01%) to 93.883% when pulling a4794ba on production_check into 55f1a43 on master.

[JoranAngevaare]

Thanks a lot @mflierm - I'll merge it after we have done a final test!

[JoranAngevaare]

Nice work Maricke!