Fix restore cmd extraflag overwrite bug

[qiuming-best]

Signed-off-by: Ming mqiu@vmware.com

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Please add a summary of your change

Fix restore from backup will override extraflag bug
Change RunBackup and RunRestore debug log into Info level log for error tracking
Check credentialsFile and caCertFile file whether are exist before remove

Does your change fix a particular issue?

Fixes #(issue)
#5346

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• Accepted the DCO. Commits without the DCO will delay acceptance.
• 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 #5347 (4022020) into main (8888f87) will increase coverage by 0.20%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##             main    #5347      +/-   ##
==========================================
+ Coverage   40.62%   40.82%   +0.20%     
==========================================
  Files         233      234       +1     
  Lines       20271    20267       -4     
==========================================
+ Hits         8235     8274      +39     
+ Misses      11437    11391      -46     
- Partials      599      602       +3     

Impacted Files	Coverage Δ
pkg/uploader/provider/restic.go	26.59% <12.50%> (-4.44%)	⬇️
pkg/restore/pv_restorer.go	65.21% <0.00%> (-2.48%)	⬇️
pkg/podvolume/backupper.go	4.66% <0.00%> (-0.15%)	⬇️
pkg/controller/backup_controller.go	48.06% <0.00%> (-0.13%)	⬇️
pkg/cmd/server/server.go	6.59% <0.00%> (-0.04%)	⬇️
pkg/repository/ensurer.go	0.00% <0.00%> (ø)
pkg/podvolume/backupper_factory.go	0.00% <0.00%> (ø)
pkg/builder/volume_snapshot_location_builder.go	0.00% <0.00%> (ø)
pkg/util/kube/pod.go	0.00% <0.00%> (ø)
pkg/restore/restore.go	64.85% <0.00%> (+0.39%)	⬆️
... and 1 more

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