Set `.var` index names in `from_h5ad_to_h5mu` #8899

Job	Run time
list	7m 18s
linting	3m 32s
viash_test (from_h5ad_to_h5mu, convert, src/convert/from_h5ad_to_h5mu/config.vsh.yaml, src/conver...	5m 35s
viash_test (make_params, files, src/files/make_params/config.vsh.yaml, src/files/make_params/, r_...	5m 15s
	21m 40s

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