Tests

shift tests to core #42

Job	Run time
Verify Towncrier entry added	6s
ubuntu-latest, python3.11, defaults	23m 57s
ubuntu-latest, python3.12, p312 numpy 2	25m 51s
ubuntu-latest, python3.10, p310 numpy 1.22	24m 11s
ubuntu-latest, python3.12, p312, numpy fallback	25m 48s
ubuntu-latest, python3.10, p310 no mkl	23m 18s
macos-12, python3.12, macos	34m 17s
macos-12, python3.11, macos - numpy fallback	31m 13s
windows-latest, python3.11, Windows	33m 39s
windows-latest, python3.10, Windows - numpy fallback	39m 9s
Finalise coverage reporting	0s
	4h 21m 29s

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