Alex Vandiver fa77be6e6c upgrade: Only run Django system checks once, explicitly. ...

These are expensive, and moving them to one explicit call early has
considerable time savings in the critical period:

```
$ hyperfine './manage.py fill_memcached_caches' './manage.py fill_memcached_caches --skip-checks'
Benchmark #1: ./manage.py fill_memcached_caches
  Time (mean ± σ):      5.264 s ±  0.146 s    [User: 4.885 s, System: 0.344 s]
  Range (min … max):    5.119 s …  5.569 s    10 runs

Benchmark #2: ./manage.py fill_memcached_caches --skip-checks
  Time (mean ± σ):      3.090 s ±  0.089 s    [User: 2.853 s, System: 0.214 s]
  Range (min … max):    2.950 s …  3.204 s    10 runs

Summary
  './manage.py fill_memcached_caches --skip-checks' ran
    1.70 ± 0.07 times faster than './manage.py fill_memcached_caches'
```

2022-05-22 14:52:38 -07:00

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