bug-report=rr pollutes the user's environment

[GlenHertz]

When running julia 1.6.0 on Linux like:

julia --bug-report=rr --project=@. runtests.jl

It will modify the project's environment:

[ Info: Loading BugReporting package...
[ Info: Package `BugReporting` not found - attempting temporary installation
    Updating registry at `~/.julia/registries/General`
    Updating git-repo `https://github.com/JuliaRegistries/General`
   Resolving package versions...
    Updating `~/JC/pkgs/MyProject.jl/Project.toml`
  [bcf9a6e7] + BugReporting v0.1.3
    Updating `~/JC/pkgs/SPICEFrontend.jl/Manifest.toml`
  [4f1ea46c] + AWSCore v0.6.17
  [1c724243] + AWSS3 v0.6.12
  [bcf9a6e7] + BugReporting v0.1.3
...

while it should create a temporary environment and not modify the user's project environment.

[Keno]

I originally had a Pkg.activate here to avoid this, but looks like that got dropped in 43d8a28 (cc @fredrikekre). @fredrikekre can you suggest a fix?

[fredrikekre]

I believe it was correct after 43d8a28 but 6d3ff11#diff-b5a3d517bf443d59c5cfe08a30886d887e477b9681c91ffdf258a8e8229266bc removed some logic there.

[fredrikekre]

Should be fixed by #40403, but note that BugReporting does not respect the --project flag (but that should be fixed in that package).