Tests

Remove legacy TreeSequenceBuilder and AncestorMatcher code #2190

Job	Run time
C tests / C unit tests	37s
Python-C tests / Python-C unit tests	1m 28s
Python packaging / Python packaging tests	1m 30s
Python (3.13, macos-latest) / Unit tests	1m 7s
Python (3.11, ubuntu-24.04) / Unit tests	1m 11s
Python (3.11, macos-latest) / Unit tests	1m 36s
Python (3.13, windows-latest) / Unit tests	3m 1s
Python (3.13, ubuntu-24.04) / Unit tests	1m 20s
Python (3.11, windows-latest) / Unit tests	2m 13s
	14m 3s

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