chore: use upload_id for staging files

[cisse21]

Description

Use upload_id for staging files instead of start_staging_file_id and end_staging_file_id

Notion Ticket

Notion Link

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: 20.00% and project coverage change: +0.01 🎉

Comparison is base (4cb5907) 53.37% compared to head (818a6b7) 53.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3066      +/-   ##
==========================================
+ Coverage   53.37%   53.39%   +0.01%     
==========================================
  Files         342      342              
  Lines       52812    52735      -77     
==========================================
- Hits        28191    28157      -34     
+ Misses      23004    22965      -39     
+ Partials     1617     1613       -4     

Impacted Files	Coverage Δ
warehouse/identities.go	1.08% <ø> (+0.03%)	⬆️
warehouse/warehouse.go	11.77% <2.40%> (-0.05%)	⬇️
warehouse/internal/repo/staging.go	80.92% <75.00%> (-0.12%)	⬇️
warehouse/api.go	69.89% <100.00%> (ø)
warehouse/internal/repo/upload.go	82.32% <100.00%> (-0.09%)	⬇️
warehouse/internal/service/staging.go	100.00% <100.00%> (ø)
services/rsources/handler.go	74.65% <0.00%> (-0.56%)	⬇️
router/router.go	77.67% <0.00%> (-0.20%)	⬇️
... and 2 more

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