Change ![] to return an object for background command

[yaxollum]

Fixes #4595

Addresses #4406 (comment)

For community

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[codecov-commenter]

Codecov Report

Merging #4823 (925f7d5) into main (259fbe5) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4823      +/-   ##
==========================================
+ Coverage   66.62%   66.64%   +0.01%     
==========================================
  Files         134      134              
  Lines       23558    23559       +1     
  Branches     4672     4673       +1     
==========================================
+ Hits        15695    15700       +5     
+ Misses       6644     6643       -1     
+ Partials     1219     1216       -3     

Flag	Coverage Δ
macOS-latest	63.64% <100.00%> (+0.06%)	⬆️
ubuntu-latest	64.23% <100.00%> (+0.03%)	⬆️
windows-latest	62.57% <50.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
xonsh/procs/pipelines.py	81.48% <100.00%> (-0.78%)	⬇️
xonsh/procs/specs.py	73.22% <100.00%> (+0.04%)	⬆️
xonsh/parsers/base.py	85.18% <0.00%> (+0.12%)	⬆️
xonsh/procs/posix.py	71.25% <0.00%> (+0.62%)	⬆️
xonsh/jobs.py	45.89% <0.00%> (+1.36%)	⬆️

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[jnoortheen]

Thanks @yaxollum