ci: test Julia "pre"

[Beforerr]

The shared workflow now drops "pre" while it resolves to the same Julia as "1" (JuliaSpacePhysics/actions#6), so it can stay listed and runs again once prereleases ship.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	01a7f98...	main / 01a7f98...
elx/full_load	0.0366 ± 0.0022 ms	0.0364 ± 0.0022 ms	1.01 ± 0.086
elx/sum_array	2.48 ± 1.1 μs	2.48 ± 1.2 μs	1 ± 0.66
elx/sum_lazy	2.65 ± 0.51 μs	2.71 ± 0.53 μs	0.979 ± 0.27
elx/sum_var_access	2.05 ± 0.96 μs	2.03 ± 0.92 μs	1.01 ± 0.66
elx/var_access	0.29 ± 0.01 μs	0.29 ± 0.01 μs	1 ± 0.049
mms/full_load	21.6 ± 2.2 μs	21.7 ± 2.2 μs	0.994 ± 0.14
mms/sum_array	0.0955 ± 0.0018 s	0.0948 ± 0.0021 s	1.01 ± 0.029
mms/sum_slice	3.51 ± 0.044 ms	3.48 ± 0.043 ms	1.01 ± 0.018
mms/sum_var_access	3.51 ± 0.049 ms	3.49 ± 0.047 ms	1.01 ± 0.02
mms/var_access	0.09 ± 0.009 μs	0.09 ± 0.01 μs	1 ± 0.15
time_to_load	0.157 ± 0.0024 s	0.154 ± 0.00031 s	1.02 ± 0.016

Memory benchmarks

	main	01a7f98...	main / 01a7f98...
elx/full_load	0.217 k allocs: 24.8 kB	0.217 k allocs: 24.8 kB	1
elx/sum_array	12 allocs: 28 kB	12 allocs: 28 kB	1
elx/sum_lazy	12 allocs: 28 kB	12 allocs: 28 kB	1
elx/sum_var_access	14 allocs: 28.3 kB	14 allocs: 28.3 kB	1
elx/var_access	1 allocs: 0.234 kB	1 allocs: 0.234 kB	1
mms/full_load	0.065 k allocs: 6.45 kB	0.065 k allocs: 6.45 kB	1
mms/sum_array	1.04 k allocs: 31.7 MB	1.04 k allocs: 31.7 MB	1
mms/sum_slice	0.069 k allocs: 1.29 MB	0.069 k allocs: 1.29 MB	1
mms/sum_var_access	0.069 k allocs: 1.29 MB	0.069 k allocs: 1.29 MB	1
mms/var_access	1 allocs: 0.219 kB	1 allocs: 0.219 kB	1
time_to_load	0.2 k allocs: 11.8 kB	0.2 k allocs: 11.8 kB	1