Update test_disk_usage for change in default du behaviour in ubuntu 24.04

[soapy1]

Description

This test started failing due to a difference in how du works on ubuntu 24.04 (the new ubuntu-latest version in GHA) and ubuntu 22.04. See the following example:

(conda-store-server-dev) sophia:conda-store-server/ (test_disk_usage-test✗) $ docker run -i
t ubuntu:24.04
Unable to find image 'ubuntu:24.04' locally
24.04: Pulling from library/ubuntu
de44b265507a: Pull complete 
Digest: sha256:80dd3c3b9c6cecb9f1667e9290b3bc61b78c2678c02cbdae5f0fea92cc6734ab
Status: Downloaded newer image for ubuntu:24.04
root@55628d140146:/# mkdir /test
root@55628d140146:/# du -sb test/
0       test/
root@55628d140146:/# 
exit

(conda-store-server-dev) sophia:conda-store-server/ (test_disk_usage-test✗) $ docker run -it ubuntu:22.04
Unable to find image 'ubuntu:22.04' locally
22.04: Pulling from library/ubuntu
6414378b6477: Pull complete 
Digest: sha256:0e5e4a57c2499249aafc3b40fcd541e9a456aab7296681a3994d631587203f97
Status: Downloaded newer image for ubuntu:22.04
root@65ab5dc1cd16:/# mkdir /test
root@65ab5dc1cd16:/# du -sb test/
4096    test/

This change updates the test to focus on the change in test tmp dir size in order to make the test more applicable across supported OSes.

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

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[peytondmurray]

Thanks for this improvement, though the test itself isn't very strict. Might be something we can improve in the future.