chore: add missing index warehouse load files table

[cisse21]

Description

Dropped an INDEX in staging file id which was required for the archival queries. Reinstated the Index now

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 has no change and project coverage change: -0.01 ⚠️

Comparison is base (51a4c45) 68.11% compared to head (cefecc8) 68.10%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/1.10.x    #3519      +/-   ##
==================================================
- Coverage           68.11%   68.10%   -0.01%     
==================================================
  Files                 331      331              
  Lines               53696    53696              
==================================================
- Hits                36573    36572       -1     
- Misses              14726    14733       +7     
+ Partials             2397     2391       -6     

see 7 files with indirect coverage changes

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