Experiment: remove precompile workload

[KristofferC]

In JuliaLang/julia#53403, I have the issue that this precompile workload errors during CI because of some weird reason with mktemp:

      From worker 2:	ERROR: LoadError: SystemError: mktemp: Operation not permitted
      From worker 2:	Stacktrace:
      From worker 2:	 [1] systemerror(p::Symbol, errno::Int32; extrainfo::Nothing)
      From worker 2:	   @ Base ./error.jl:176
      From worker 2:	 [2] systemerror
      From worker 2:	   @ ./error.jl:175 [inlined]
      From worker 2:	 [3] mktemp(parent::String; cleanup::Bool)
      From worker 2:	   @ Base.Filesystem ./file.jl:676
      From worker 2:	 [4] mktemp
      From worker 2:	   @ ./file.jl:673 [inlined]
      From worker 2:	 [5] mktemp()
      From worker 2:	   @ Base.Filesystem ./file.jl:673
      From worker 2:	 [6] top-level scope
      From worker 2:	   @ ~/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-master/julia-4a04df3954/share/julia/stdlib/v1.12/Downloads/src/Downloads.jl:471

This is to try out the PR without the workload. If it works, I am inclined to just remove this because the value of it is marginal at best.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.53%. Comparing base (05f9ec2) to head (56040d5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #237      +/-   ##
==========================================
- Coverage   89.70%   89.53%   -0.18%     
==========================================
  Files           5        5              
  Lines         583      583              
==========================================
- Hits          523      522       -1     
- Misses         60       61       +1     

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