1284: Use Symfony scheduler for import and populate jobs

[turegjorup]

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Checklist

• My code is covered by test cases.
• My code passes our test (all our tests).
• My code passes our static analysis suite.
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.40%. Comparing base (5bf666e) to head (b1d9015).
Report is 32 commits behind head on develop.

❗ Current head b1d9015 differs from pull request most recent head d9b8080

Please upload reports for the commit d9b8080 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff              @@
##             develop     #43      +/-   ##
============================================
- Coverage       0.42%   0.40%   -0.02%     
- Complexity       833     861      +28     
============================================
  Files            120     124       +4     
  Lines           3034    3174     +140     
============================================
  Hits              13      13              
- Misses          3021    3161     +140     

Flag	Coverage Δ
8.3	0.40% <ø> (-0.02%)	⬇️
unittests	0.40% <ø> (-0.02%)	⬇️

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