add missing CompletionTimestamp and metrics when restore moved into terminal phase

[Nutrymaco]

Please add a summary of your change

As i understood when we move Restore into terminal phase (Completed, PartiallyFailure, Failure) we should set CompletionTimestamp and register metrics. But if we wait async operations we do not do this.

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• [x ] Accepted the DCO. Commits without the DCO will delay acceptance.
• [ x] Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov-commenter]

Codecov Report

Merging #6397 (454fc9b) into main (e3e0ce3) will decrease coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main    #6397      +/-   ##
==========================================
- Coverage   51.15%   51.15%   -0.01%     
==========================================
  Files         228      228              
  Lines       23777    23782       +5     
==========================================
+ Hits        12163    12165       +2     
- Misses      10715    10718       +3     
  Partials      899      899              

Impacted Files	Coverage Δ
pkg/controller/restore_operations_controller.go	47.10% <33.33%> (-0.15%)	⬇️