test cleanup for #44444 (#44993)
This warning was un-ironically introduced by "Fix or suppress some noisy tests".
```
┌ Error: mktemp cleanup
│ exception =
│ IOError: unlink("C:\\Windows\\TEMP\\jl_A49B.tmp"): resource busy or locked (EBUSY)
│ Stacktrace:
│ [1] uv_error
│ @ .\libuv.jl:100 [inlined]
│ [2] unlink(p::String)
│ @ Base.Filesystem .\file.jl:968
│ [3] rm(path::String; force::Bool, recursive::Bool)
│ @ Base.Filesystem .\file.jl:283
│ [4] rm
│ @ .\file.jl:274 [inlined]
│ [5] mktemp(fn::Main.Test49Main_misc.var"#110#113", parent::String)
│ @ Base.Filesystem .\file.jl:736
│ [6] mktemp(fn::Function)
│ @ Base.Filesystem .\file.jl:730
│ [7] macro expansion
│ @ C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\test\misc.jl:1065 [inlined]
│ [8] macro expansion
│ @ C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\stdlib\v1.9\Test\src\Test.jl:1360 [inlined]
│ [9] top-level scope
│ @ C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\test\misc.jl:1060
│ [10] include
│ @ .\Base.jl:427 [inlined]
│ [11] macro expansion
│ @ C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\test\testdefs.jl:24 [inlined]
│ [12] macro expansion
│ @ C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\stdlib\v1.9\Test\src\Test.jl:1360 [inlined]
│ [13] macro expansion
│ @ C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\test\testdefs.jl:23 [inlined]
│ [14] macro expansion
│ @ .\timing.jl:440 [inlined]
│ [15] runtests(name::String, path::String, isolate::Bool; seed::UInt128)
│ @ Main C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\test\testdefs.jl:21
│ [16] invokelatest(::Any, ::Any, ::Vararg{Any}; kwargs::Base.Pairs{Symbol, UInt128, Tuple{Symbol}, NamedTuple{(:seed,), Tuple{UInt128}}})
│ @ Base .\essentials.jl:798
│ [17] (::Distributed.var"#110#112"{Distributed.CallMsg{:call_fetch}})()
│ @ Distributed C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\stdlib\v1.9\Distributed\src\process_messages.jl:285
│ [18] run_work_thunk(thunk::Distributed.var"#110#112"{Distributed.CallMsg{:call_fetch}}, print_error::Bool)
│ @ Distributed C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\stdlib\v1.9\Distributed\src\process_messages.jl:70
│ [19] macro expansion
│ @ C:\buildbot\worker-tabularasa\tester_win64\build\share\julia\stdlib\v1.9\Distributed\src\process_messages.jl:285 [inlined]
│ [20] (::Distributed.var"#109#111"{Distributed.CallMsg{:call_fetch}, Distributed.MsgHeader, Sockets.TCPSocket})()
│ @ Distributed .\task.jl:490
└ @ Base.Filesystem file.jl:738
```
