Add schedule backup timing E2E test

[danfengliu]

Signed-off-by: danfengl [email protected]

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Does your change fix a particular issue?

Fixes #5033

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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 #5355 (54aa90b) into main (100d6b4) will decrease coverage by 0.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5355      +/-   ##
==========================================
- Coverage   40.84%   40.61%   -0.24%     
==========================================
  Files         234      234              
  Lines       20260    20293      +33     
==========================================
- Hits         8276     8241      -35     
- Misses      11383    11450      +67     
- Partials      601      602       +1     

Impacted Files	Coverage Δ
pkg/uploader/provider/restic.go	26.59% <0.00%> (-4.44%)	⬇️
pkg/plugin/clientmgmt/manager.go	80.00% <0.00%> (-1.33%)	⬇️
pkg/controller/pod_volume_backup_controller.go	39.15% <0.00%> (-0.42%)	⬇️
pkg/restore/restore.go	64.72% <0.00%> (-0.14%)	⬇️
pkg/cmd/server/server.go	6.59% <0.00%> (ø)
pkg/cmd/cli/restic/server.go	12.50% <0.00%> (ø)
pkg/plugin/framework/server.go	0.00% <0.00%> (ø)
pkg/controller/backup_controller.go	48.06% <0.00%> (ø)
pkg/plugin/framework/object_store.go	0.00% <0.00%> (ø)
pkg/plugin/framework/plugin_lister.go	0.00% <0.00%> (ø)
... and 50 more

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