Add more informative error message in @import_required_backends

Passed in 4m 28s
:pipeline:buildkite-agent pipeline upload
Waited 41s
Ran in 5s
initializeecho "--- Instantiate project" && julia --project=test -e 'using Pkg; Pkg.develop(;path="."); Pkg.add("CUDA"); Pkg.add("MPI"); Pkg.instantiate(;verbose=true); Pkg.precompile(;strict=true)' && julia --project=test -e 'using CUDA; CUDA.precompile_runtime()' && julia --project=test -e 'using Pkg; Pkg.status()'
Waited 44s
Ran in 2m 52s
馃捇 test with incomplete environmentjulia --project -E "using ClimaComms, Test; @test_throws ErrorException @import_required_backends"
Waited 23s
Ran in 2s
馃捇 testsjulia --project=test test/runtests.jl
Waited 23s
Ran in 5s
馃捇 tests MPIsrun julia --project=test test/runtests.jl
Waited 23s
Ran in 8s
馃捇 threaded testsjulia --threads 4 --project=test test/runtests.jl
Waited 23s
Ran in 6s
馃捇 threaded tests MPIsrun julia --threads 4 --project=test test/runtests.jl
Waited 23s
Ran in 8s
馃幋 testsjulia --project=test test/runtests.jl
Waited 14s
Ran in 34s
馃幋 tests MPIsrun julia --project=test test/runtests.jl
Waited 8s
Ran in 39s
Total Job Run Time: 4m 39s