Issue fix 5477

[Lyndon-Li]

Issue fix 5477: create the common way to support S3 compatible object storages that work for both Restic and Kopia; Keep the resticRepoPrefix parameter for compatibility

fix issue #5477

[Lyndon-Li]

@sseago @shubham-pampattiwar

Please help to review this PR. This involves a behavior change - technically we want to remove the resticRepoPrefix parameter in BSL's spec.Config map because it works for Restic only, so this PR makes a slight code change to make the second way(specify endpoint, bucket, etc. separately) work; meanwhile, we just keep it there for compatibility.

Check the issue description for details.

[codecov-commenter]

Codecov Report

Merging #5478 (9695340) into main (11a7c79) will increase coverage by 0.15%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main    #5478      +/-   ##
==========================================
+ Coverage   40.56%   40.72%   +0.15%     
==========================================
  Files         236      238       +2     
  Lines       20484    20568      +84     
==========================================
+ Hits         8310     8376      +66     
- Misses      11565    11576      +11     
- Partials      609      616       +7     

Impacted Files	Coverage Δ
pkg/restic/common.go	26.86% <0.00%> (ø)
pkg/repository/config/config.go	100.00% <100.00%> (+4.08%)	⬆️
pkg/repository/provider/unified_repo.go	57.83% <100.00%> (ø)
pkg/restore/restore.go	64.16% <0.00%> (-0.57%)	⬇️
pkg/builder/object_meta.go	0.00% <0.00%> (ø)
pkg/builder/volume_snapshot_builder.go	0.00% <0.00%> (ø)
pkg/builder/volume_snapshot_content_builder.go	0.00% <0.00%> (ø)
pkg/controller/backup_controller.go	55.23% <0.00%> (+7.07%)	⬆️

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