enhance backup/restore error by adding velero logs

[kaovilai]

No description provided.

[codecov-commenter]

Codecov Report

Merging #469 (b7e4b4d) into master (16f7a20) will decrease coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #469      +/-   ##
==========================================
- Coverage   41.51%   41.30%   -0.22%     
==========================================
  Files           9        9              
  Lines        1869     1845      -24     
==========================================
- Hits          776      762      -14     
+ Misses       1040     1033       -7     
+ Partials       53       50       -3     

Impacted Files	Coverage Δ
controllers/registry.go	42.72% <100.00%> (+1.71%)	⬆️
controllers/restic.go	54.35% <100.00%> (-2.86%)	⬇️
controllers/velero.go	36.22% <100.00%> (-2.05%)	⬇️

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