Indicate which project(s) are active when emitting Pkg errors

[LilithHafner]

When working with AirspeedVelocity.jl, I got this error:

shell> benchpkg
ERROR: LoadError: ArgumentError: Package AirspeedVelocity [1c8270ee-6884-45cc-9545-60fa71ec23e4] is required but does not seem to be installed:
 - Run `Pkg.instantiate()` to install all recorded dependencies.

Stacktrace:
  [1] _require(pkg::Base.PkgId, env::String)
    @ Base ./loading.jl:2515
  [2] __require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2388
  [3] #invoke_in_world#3
    @ ./essentials.jl:1089 [inlined]
  [4] invoke_in_world
    @ ./essentials.jl:1086 [inlined]
  [5] _require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2375
  [6] macro expansion
    @ ./loading.jl:2314 [inlined]
  [7] macro expansion
    @ ./lock.jl:273 [inlined]
  [8] __require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2271
  [9] #invoke_in_world#3
    @ ./essentials.jl:1089 [inlined]
 [10] invoke_in_world
    @ ./essentials.jl:1086 [inlined]
 [11] require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2260
in expression starting at /home/x/.julia/bin/benchpkg:13

The Pkg level issue here is that there is no indication of what project I must activate before running Pkg.instantiate(), nor is there any apparent way to get that information.