`reproducibility_test: true` fails locally

[haakon-e]

When model configs set reproducibility_test: true, the ci_driver.jl results in the following error

ERROR: LoadError: IOError: readdir("/resnick/scratch/esm/slurm-buildkite/climaatmos-main"): no such file or directory (ENOENT)
Stacktrace:
 [1] uv_error
   @ ./libuv.jl:106 [inlined]
 [2] _readdir(dir::String; return_objects::Bool, join::Bool, sort::Bool)
   @ Base.Filesystem ./file.jl:995
 [3] _readdir
   @ ./file.jl:988 [inlined]
 [4] readdir
   @ ./file.jl:917 [inlined]
 [5] export_reproducibility_results(field_vec::ClimaCore.Fields.FieldVector{…}, comms_ctx::ClimaComms.SingletonCommsContext{…}; job_id::String, computed_dir::String, save_dir::String, name::String, reference_filename::String, computed_filename::String, n::Int64, ref_counter_PR::Int64, skip::Bool, repro_folder::String)
   @ Main ~/Documents/CliMA/clima-codes/ClimaAtmos.jl/oa/fix_trace_gases/reproducibility_tests/reproducibility_tools.jl:278
 [6] top-level scope
   @ ~/Documents/CliMA/clima-codes/ClimaAtmos.jl/oa/fix_trace_gases/.buildkite/ci_driver.jl:109
 [7] include(fname::String)
   @ Main ./sysimg.jl:38
 [8] top-level scope
   @ REPL[3]:1
 [9] top-level scope
   @ none:1
in expression starting at ~/ClimaAtmos.jl/.buildkite/ci_driver.jl:99

when running locally. It would probably be nice to check for this