Fix scheduled jobs

[ArtOfCode-]

Changes our scripts to use perform_now instead of perform_later so that jobs actually run. Also removes a few old one-time maintenance scripts that are no longer required, and moves a couple of old scripts to jobs instead.

[codecov]

Codecov Report

❌ Patch coverage is 40.74074% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.75%. Comparing base (84435d4) to head (833786a).
⚠️ Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
app/jobs/recalc_abilities_job.rb	32.25%	21 Missing ⚠️
app/jobs/mail_uncaptured_donations_job.rb	50.00%	11 Missing ⚠️

Additional details and impacted files

Components	Coverage Δ
controllers	75.82% <ø> (+0.25%)	⬆️
helpers	85.08% <ø> (ø)
jobs	66.88% <40.74%> (-14.31%)	⬇️
models	93.03% <ø> (ø)
tasks	61.11% <ø> (ø)

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[Oaphi]

Non-blocking: I don't think we need to parametrize it all, do we? We don't use the param anyway, so let's avoid creating mental overhead for those less familiar with the syntax.

[Oaphi]

LGTM - low-ish coverage is fine here as there are (a) no changes in how the jobs function, only in how they are executed (+ some of the scripts are wrapped into proper jobs) and (b) it's due to low initial coverage for jobs in general.