add more precise error when rabbitMQ cannot be reached when storing raw files

[underdarknl]

Changes

Specifically catches the rabbitMQ errors which might occur if (even after the retries) it still cannot be reached.
The original 500 does not show the stacktrace in de logs, and as such there is no easy way for the user to know rabbitMQ might be at fault.

Issue link

bytes-1                | $IP:$PORT - "POST /bytes/raw?boefje_meta_id=$SOME_UUID HTTP/1.1" 500
bytes-1                | fastapi.exceptions.HTTPException: 500: Could not save raw data

Closes ...

Demo

Please add some proof in the form of screenshots or screen recordings to show (off) new functionality, if there are interesting new features for end-users.

QA notes

Please add some information for QA on how to test the newly created code.

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Code Checklist

• All the commits in this PR are properly PGP-signed and verified.
• This PR only contains functionality relevant to the issue.
• I have written unit tests for the changes or fixes I made.
• I have checked the documentation and made changes where necessary.
• I have performed a self-review of my code and refactored it to the best of my abilities.

• Tickets have been created for newly discovered issues.
• For any non-trivial functionality, I have added integration and/or end-to-end tests.
• I have informed others of any required .env changes files if required and changed the .env-dist accordingly.
• I have included comments in the code to elaborate on what is not self-evident from the code itself, including references to issues and discussions online, or implicit behavior of an interface.

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Checklist for code reviewers:

Copy-paste the checklist from the docs/source/templates folder into your comment.

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Checklist for QA:

Copy-paste the checklist from the docs/source/templates folder into your comment.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
16.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud