spawn: ignorestatus should work on CmdRedirect (JuliaLang#59358)

It works on the other AbstractCmds, the fact that it doesn't work on
this one is an oversight.

Author: Keno

base/cmd.jl

@@ -225,6 +225,8 @@ Mark a command object so that running it will not throw an error if the result c
 ignorestatus(cmd::Cmd) = Cmd(cmd, ignorestatus=true)
 ignorestatus(cmd::Union{OrCmds,AndCmds}) =
     typeof(cmd)(ignorestatus(cmd.a), ignorestatus(cmd.b))
+ignorestatus(cmd::CmdRedirect) =
+    CmdRedirect(ignorestatus(cmd.cmd), cmd.handle, cmd.stream_no, cmd.readable)
 
 """
     detach(command)

test/spawn.jl

@@ -124,6 +124,7 @@ end
 @test !success(ignorestatus(falsecmd) & falsecmd)
 @test_broken  success(ignorestatus(pipeline(falsecmd, falsecmd)))
 @test_broken  success(ignorestatus(falsecmd & falsecmd))
+@test run(ignorestatus(pipeline(falsecmd; stderr=devnull, stdout=devnull))).exitcode != 0
 
 # stdin Redirection
 let file = tempname()