Add job-specific logging

[ArtOfCode-]

Related to #1995.

Adds a job-specific logger tagged with the job class and randomised ID, and adds logging to our existing jobs.

[codecov]

Codecov Report

❌ Patch coverage is 55.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.96%. Comparing base (0e88121) to head (f944c17).
⚠️ Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
app/jobs/cleanup_votes_job.rb	0.00%	12 Missing ⚠️
app/jobs/clean_up_new_thread_followers_job.rb	40.00%	3 Missing ⚠️
app/jobs/clean_up_thread_followers_job.rb	40.00%	3 Missing ⚠️

Additional details and impacted files

Components	Coverage Δ
controllers	75.57% <ø> (-0.04%)	⬇️
helpers	85.08% <ø> (ø)
jobs	81.18% <55.00%> (-0.30%)	⬇️
models	93.03% <ø> (ø)
tasks	61.11% <ø> (ø)

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[Oaphi]

LGTM - not worried about coverage here, it's mostly because we barely have any for jobs in the first place.