Removing all instances of unittest #10694

Job	Run time
style	22s
Example notebooks (ubuntu-latest / Python 3.12)	18m 0s
Doctests (ubuntu-latest / Python 3.11)	3m 48s
Example scripts (ubuntu-latest / Python 3.12)	14m 0s
Tests (ubuntu-latest / Python 3.9)	29m 44s
Tests (ubuntu-latest / Python 3.10)	31m 0s
Tests (ubuntu-latest / Python 3.11)	26m 19s
Tests (ubuntu-latest / Python 3.12)	33m 35s
Tests (macos-12 / Python 3.9)	20m 22s
Tests (macos-12 / Python 3.10)	20m 48s
Tests (macos-12 / Python 3.11)	20m 59s
Tests (macos-12 / Python 3.12)	16m 37s
Tests (macos-14 / Python 3.9)	11m 37s
Tests (macos-14 / Python 3.10)	9m 58s
Tests (macos-14 / Python 3.11)	17m 22s
Tests (macos-14 / Python 3.12)	9m 46s
Tests (windows-latest / Python 3.9)	31m 51s
Tests (windows-latest / Python 3.10)	32m 30s
Tests (windows-latest / Python 3.11)	27m 15s
Tests (windows-latest / Python 3.12)	24m 18s
	6h 40m 11s

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