precompile test failures in 1.12.1

[antonio-rojas]

1.12.1 regressed some tests in precompile when run after a clean build:

Error in testset precompile:
Test Failed at /build/julia/src/julia-1.12.1/test/precompile.jl:1435
  Expression: read(fname, String) == "Iterators\n"
   Evaluated: "Precompiling packages...\n    640.8 ms  ✓ Test6c92f26 (serial)\n  1 dependency successfully precompiled in 1 seconds\nIterators\n" == "Iterators\n"

Error in testset precompile:
Error During Test at /build/julia/src/julia-1.12.1/test/testdefs.jl:24
  Got exception outside of a @test
  The `precompile` test set changed the active project and did not restore the original value
  Stacktrace:
    [1] error(s::String)
      @ Base ./error.jl:44
    [2] macro expansion
      @ ~/julia/src/julia-1.12.1/test/testdefs.jl:79 [inlined]
    [3] macro expansion
      @ ~/julia/src/julia-1.12.1/usr/share/julia/stdlib/v1.12/Test/src/Test.jl:1776 [inlined]
    [4] macro expansion
      @ ~/julia/src/julia-1.12.1/test/testdefs.jl:26 [inlined]
    [5] macro expansion
      @ ./timing.jl:689 [inlined]
    [6] runtests(name::String, path::String, isolate::Bool; seed::UInt128)
      @ Main ~/julia/src/julia-1.12.1/test/testdefs.jl:24
    [7] #invokelatest_gr#232
      @ ./reflection.jl:1282 [inlined]
    [8] invokelatest_gr
      @ ./reflection.jl:1274 [inlined]
    [9] (::var"#33#34")()
      @ Main ~/julia/src/julia-1.12.1/test/runtests.jl:352
   [10] cd(f::var"#33#34", dir::String)
      @ Base.Filesystem ./file.jl:112
   [11] top-level scope
      @ ~/julia/src/julia-1.12.1/test/runtests.jl:92
   [12] include(mod::Module, _path::String)
      @ Base ./Base.jl:306
   [13] exec_options(opts::Base.JLOptions)
      @ Base ./client.jl:317
   [14] _start()
      @ Base ./client.jl:550
ERROR: LoadError: Test run finished with errors

Bisected to cceb0f9. The full build and test commands used are available at https://gitlab.archlinux.org/archlinux/packaging/packages/julia/-/blob/2-1.12.0-1/PKGBUILD?ref_type=tags#L58-137