missing / healed chunks: always tell chunk ID, fixes #5704

[ghost]

This is a back-port attempt of #5778. It is intended to be part of issue #5838.

[ThomasWaldmann]

This one looks good, just triggered the CI run...

[codecov-commenter]

Codecov Report

Merging #5845 (15318dc) into 1.1-maint (4c4c00f) will not change coverage.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           1.1-maint    #5845   +/-   ##
==========================================
  Coverage      79.84%   79.84%           
==========================================
  Files             27       27           
  Lines          10453    10453           
  Branches        1841     1841           
==========================================
  Hits            8346     8346           
  Misses          1582     1582           
  Partials         525      525           

Impacted Files	Coverage Δ
src/borg/archive.py	82.06% <75.00%> (-0.30%)	⬇️
src/borg/repository.py	85.13% <0.00%> (-0.20%)	⬇️
src/borg/archiver.py	81.34% <0.00%> (+0.28%)	⬆️

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[ThomasWaldmann]

LGTM