ctrl-c must not kill important subprocesses, fixes #6912

[ThomasWaldmann]

[ThomasWaldmann]

Did a quick test running a borg create against a ssh: remote repo: it behaves now as expected:

• no "broken pipe"
• successfully writes checkpoint

[ThomasWaldmann]

There are some other places with subprocesses:

• --content-from-command
• --paths-from-command
• import-tar / export-tar (for the (de)compression filter process)

Guess we do not want these killed by ctrl-c either. borg needs to determine when it wants to finish.

[codecov-commenter]

Codecov Report

Merging #6944 (7a31978) into 1.2-maint (fa8d8ec) will increase coverage by 0.00%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           1.2-maint    #6944   +/-   ##
==========================================
  Coverage      82.90%   82.91%           
==========================================
  Files             38       38           
  Lines          10579    10581    +2     
  Branches        2210     2210           
==========================================
+ Hits            8771     8773    +2     
- Misses          1285     1286    +1     
+ Partials         523      522    -1     

Impacted Files	Coverage Δ
src/borg/helpers/process.py	65.30% <50.00%> (-0.16%)	:arrow_down:
src/borg/archiver.py	80.20% <100.00%> (+0.09%)	:arrow_up:
src/borg/remote.py	79.52% <100.00%> (-0.33%)	:arrow_down:
src/borg/platform/base.py	80.15% <0.00%> (-1.59%)	:arrow_down:
src/borg/repository.py	83.57% <0.00%> (-0.19%)	:arrow_down:
src/borg/helpers/parseformat.py	89.88% <0.00%> (+0.16%)	:arrow_up:
src/borg/archive.py	82.32% <0.00%> (+0.24%)	:arrow_up:

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