Add a final calc_coeffs computation to ensure the auxillary state is … #4336

Job	Run time
Generate shards	1s
[ubuntu-latest][Python 3.10][1/8] Core TORAX tests	2m 14s
[ubuntu-latest][Python 3.10][2/8] Core TORAX tests	2m 57s
[ubuntu-latest][Python 3.10][3/8] Core TORAX tests	2m 8s
[ubuntu-latest][Python 3.10][4/8] Core TORAX tests	2m 47s
[ubuntu-latest][Python 3.10][5/8] Core TORAX tests	2m 41s
[ubuntu-latest][Python 3.10][6/8] Core TORAX tests	2m 30s
[ubuntu-latest][Python 3.10][7/8] Core TORAX tests	2m 21s
[ubuntu-latest][Python 3.10][8/8] Core TORAX tests	2m 29s
	20m 8s

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