[Main] Fix issue 5696

[Lyndon-Li]

Fix issue 5696, check if the repo is still openable before running the prune and forget operation, if it is not, try to reconnect the repo

[codecov-commenter]

Codecov Report

Merging #5715 (32eb865) into main (55873c1) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #5715      +/-   ##
==========================================
- Coverage   40.92%   40.85%   -0.07%     
==========================================
  Files         239      239              
  Lines       20630    20663      +33     
==========================================
  Hits         8442     8442              
- Misses      11571    11604      +33     
  Partials      617      617              

Impacted Files	Coverage Δ
pkg/repository/manager.go	18.04% <0.00%> (-0.86%)	⬇️
pkg/repository/provider/restic.go	0.00% <0.00%> (ø)
pkg/repository/provider/unified_repo.go	54.16% <0.00%> (-4.05%)	⬇️

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