[release-1.10] Fix the trailing task warning on lazy artifacts

[IanButterworth]

Fixes the issue where downloading i.e. MKL during precompilation causes the trailing task warning.

It's already fixed on 1.11+ because finalizers (the global Downloader finalizer) runs before the trailing task detector on 1.11+

[IanButterworth]

Confirmed to fix the issue (on a linux system)

$ JULIA_DEPOT_PATH=$(mktemp -d) ./julia -e 'using Pkg; Pkg.add(name="CUDA_Driver_jll", version="0.9.0")'                                            
  Installing known registries into `/tmp/tmp.cbXhw2NPkR`                                                                                                                         
    Updating registry at `/tmp/tmp.cbXhw2NPkR/registries/General.toml`                                                                                                           
   Resolving package versions...                                                                                                                                                 
   Installed JLLWrappers ───── v1.5.0                                                                                                                                            
   Installed Preferences ───── v1.4.3                                                                                                                                            
   Installed CUDA_Driver_jll ─ v0.9.0+0                                                                                                                                          
    Updating `/tmp/tmp.cbXhw2NPkR/environments/v1.10/Project.toml`
⌃ [4ee394cb] + CUDA_Driver_jll v0.9.0+0
    Updating `/tmp/tmp.cbXhw2NPkR/environments/v1.10/Manifest.toml`
  [692b3bcd] + JLLWrappers v1.5.0
  [21216c6a] + Preferences v1.4.3
⌃ [4ee394cb] + CUDA_Driver_jll v0.9.0+0
  [0dad84c5] + ArgTools v1.1.1
  [56f22d72] + Artifacts
  [2a0f44e3] + Base64
  [ade2ca70] + Dates
  [f43a241f] + Downloads v1.6.0
  [7b1f6079] + FileWatching
  [b77e0a4c] + InteractiveUtils
  [4af54fe1] + LazyArtifacts
  [b27032c2] + LibCURL v0.6.4
  [76f85450] + LibGit2
  [8f399da3] + Libdl
  [56ddb016] + Logging
  [d6f4376e] + Markdown
  [ca575930] + NetworkOptions v1.2.0
  [44cfe95a] + Pkg v1.10.0
  [de0858da] + Printf
  [3fa0cd96] + REPL
  [9a3f8284] + Random
  [ea8e919c] + SHA v0.7.0
  [9e88b42a] + Serialization
  [6462fe0b] + Sockets
  [fa267f1f] + TOML v1.0.3
  [a4e569a6] + Tar v1.10.0
  [cf7118a7] + UUIDs
  [4ec0a83e] + Unicode
  [deac9b47] + LibCURL_jll v8.4.0+0
  [e37daf67] + LibGit2_jll v1.6.4+0
  [29816b5a] + LibSSH2_jll v1.11.0+1
  [c8ffd9c3] + MbedTLS_jll v2.28.2+1
  [14a3606d] + MozillaCACerts_jll v2023.1.10
  [83775a58] + Zlib_jll v1.2.13+1
  [8e850ede] + nghttp2_jll v1.52.0+1
  [3f19e933] + p7zip_jll v17.4.0+2
        Info Packages marked with ⌃ have new versions available and may be upgradable.
Precompiling project...
  5 dependencies successfully precompiled in 10 seconds
  1 dependency had output during precompilation:
┌ CUDA_Driver_jll
│   Downloading artifact: CUDA_Driver
└  

[GunnarFarneback]

Where is this issue discussed for 1.11+? I can confirm that this test case works on a Linux source build of the 1.10 branch but both 1.11.0-rc2 and 1.12.0-DEV.1085 (2024-08-23) from juliaup still give the warning.

[IanButterworth]

JuliaLang/Downloads.jl#234