chore: dedup destination metadata in router based on job id

[atzoum]

Description

Workaround until transformer adaptations are ready so that we can enforce validations introduced by #2970

Notion Ticket

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

Base: 52.21% // Head: 52.35% // Increases project coverage by +0.13% 🎉

Coverage data is based on head (8d03654) compared to base (03e7390).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 8d03654 differs from pull request most recent head c48a45f. Consider uploading reports for the commit c48a45f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2982      +/-   ##
==========================================
+ Coverage   52.21%   52.35%   +0.13%     
==========================================
  Files         328      328              
  Lines       51468    51472       +4     
==========================================
+ Hits        26876    26950      +74     
+ Misses      22975    22902      -73     
- Partials     1617     1620       +3     

Impacted Files	Coverage Δ
router/router.go	76.95% <100.00%> (+0.24%)	⬆️
services/rsources/handler.go	74.65% <0.00%> (-0.56%)	⬇️
jobsdb/backup.go	75.76% <0.00%> (+0.35%)	⬆️
jobsdb/migration.go	78.35% <0.00%> (+2.06%)	⬆️
processor/stash/stash.go	66.66% <0.00%> (+21.61%)	⬆️

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