`Pkg.Operations.install_archive`: when unpacking the archive, always rethrow the caught exception unless it is a `ProcessFailedException`

[DilumAluthge]

This is a follow-up to #2968.

The purpose of #2968 is only to catch the error that has the error message Can not open the file as archive. This error message comes from 7zip when the following 7zip command fails:[^1] https://github.com/JuliaLang/Pkg.jl/blob/c991ce0a31b784133e061816d21f7d2556a182e7/src/PlatformEngines.jl#L387-L387

This is illustrated in the stacktrace posted in https://github.com/JuliaPackaging/Yggdrasil/issues/4358.

So, we don't actually need to catch all exceptions; instead, we only need to catch the exception that is thrown when the above 7zip command fails. That exception is of the ProcessFailedException type. Therefore, we should always rethrow the caught exception unless it is a ProcessFailedException.

[^1]: While the command itself is defined in Pkg.PlatformEngines in the code snippet shown abve, the line on which that command is actually run is this line: https://github.com/JuliaIO/ArgTools.jl/blob/08b11b2707593d4d7f92e5f1b9dba7668285ff82/src/ArgTools.jl#L75. That is, the method that is used to run the command is Base.open(f::Function, arg::Cmd).

[DilumAluthge]

@StefanKarpinski @KristofferC Does this look correct? I figure it would be best if we only catch the narrowest necessary set of exceptions.