fix: do not delete staging files when opted for rudderstorge during archival

[achettyiitr]

Description

• Do not delete staging files during archival if opted for rudder storage, since there is already a retention policy set for the bucket.
• Also, by doing so, we will have an option to re-sync the data. We have seen a couple of cases, where customers opted for the rudder storage option and backups were not enabled.

Linear Ticket

• https://linear.app/rudderstack/issue/PIPE-197/stop-deleting-staging-files-during-archival-for-use-rudder-storage

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 70.00% and project coverage change: +0.12% 🎉

Comparison is base (ec07777) 68.99% compared to head (2766039) 69.12%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3801      +/-   ##
==========================================
+ Coverage   68.99%   69.12%   +0.12%     
==========================================
  Files         349      349              
  Lines       51887    51867      -20     
==========================================
+ Hits        35798    35851      +53     
+ Misses      13782    13714      -68     
+ Partials     2307     2302       -5     

Files Changed	Coverage Δ
warehouse/archive/archiver.go	68.02% <70.00%> (+0.76%)	⬆️

... and 12 files with indirect coverage changes

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