Add Solid Queue backend for Active Job

[MrSerth]

With these changes, we introduce a dedicated job backend for CodeOcean and migrate away from the default :async backend. This will improve reliability and allow for future introduction of developer-defined jobs. For now, the backend is mainly used for library-defined jobs.

This PR assumes that the following PR is merged first:

• 2524

However, since the PR linked is mainly about documentation, this is not a show-stopper.

[MrSerth]

What's the difference between developer-defined jobs and library-defined jobs in the CodeOcean context? Is this Solid Queue wording? 🤔

I chose this wording myself and would define the terms as follows:

• developer-defined job: A job that is defined in this repository, namely in app/jobs.
• library-defined jobs: A job that is not defined in this repository, but still available to the application during run. For example, Solid Cable (see #2525) includes a SolidCable::TrimJob (see here), that is expected to be run regularly. The default for SolidCable::TrimJob is once per day. Despite the newly introduced SolidCable job, there are other jobs included through the framework or library (like for ActiveStorage, or when mails are delivered later).

Seems like I have to read more about Solid Queue soonish. 😇

Yes, that's definitely recommended! Solid Queue is now a default with Rails 8, so feel free to read more about it :+1.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 69.53%. Comparing base (80b2ae6) to head (7d3e17f). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
app/jobs/concerns/active_record_logging.rb	50.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2526 +/- ## ========================================== - Coverage 69.54% 69.53% -0.01% ========================================== Files 200 202 +2 Lines 6350 6362 +12 ========================================== + Hits 4416 4424 +8 - Misses 1934 1938 +4 ```

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