Use random arrays for memory testing

[dstansby]

It turns out if you increase the size of a dask array using da.repeat(...), dask is clever and doesn't make actual copies of the data. This is great, unless you're running memory benchmarks and want the memory useage to increase 🙈

This PR changes the sample data to be random data generated by dask, instead of repeating existing data. Although the cell detection results won't be meaningful on this data, it provides a easy way to run memory benchmarks.

To confirm this works, here's the memory usage of just detection, which shows a clear increase when the array size is increased:

Repeats = 1

Repeats = 2

[codecov]

Codecov Report

Base: 99.13% // Head: 99.13% // No change to project coverage 👍

Coverage data is based on head (2148a24) compared to base (6ee7685).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
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  Coverage   99.13%   99.13%           
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  Files           9        9           
  Lines         231      231           
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  Hits          229      229           
  Misses          2        2           

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