When registering binfmt_misc entries, print an @info message about sudo even if verbose is false

[DilumAluthge]

Users will probably wonder why they are being asked for their sudo password (especially if they want to use the unprivileged user namespaces executor), so we should always show the @info message explaining why, even if verbose is false.

[codecov]

Codecov Report

Merging #59 (40cd021) into main (51bf7f4) will increase coverage by 0.07%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   79.01%   79.09%   +0.07%     
==========================================
  Files           6        6              
  Lines         529      531       +2     
==========================================
+ Hits          418      420       +2     
  Misses        111      111              

Impacted Files	Coverage Δ
src/binfmt_misc.jl	80.19% <60.00%> (+0.60%)	⬆️
src/Sandbox.jl	73.21% <0.00%> (-0.47%)	⬇️
src/Docker.jl	85.03% <0.00%> (+0.11%)	⬆️

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[staticfloat]

Maybe instead we can test to see if sudo is going to ask for a password, and print the message only if we think it will? Testing if !success(sudo -k -n true) should tell us if sudo is going to require a password.

[DilumAluthge]

Done!