optimisation for product page

[pkrawat1]

Why?

• Product listing in admin panel is firing too many queries.

This change addresses the need by:

• Optimises rummage queries to preload all the queries required to render product list

[delivers #pivotal_story_id]

Checklist

• [ ] I have read CONTRIBUTING.md.
• [ ] My code follows the style guidelines of this project.
• [ ] I have commented my code, particularly in hard-to-understand areas.
• [ ] My code does not generate any (new) credo and compile-time warnings.
• [ ] I have updated the documentation wherever necessary.
• [ ] I have added tests to cover my changes.

[codecov[bot]]

Codecov Report

Merging #461 into develop will not change coverage. The diff coverage is 100%.

@@           Coverage Diff            @@
##           develop     #461   +/-   ##
========================================
  Coverage    78.11%   78.11%           
========================================
  Files          174      174           
  Lines         2138     2138           
========================================
  Hits          1670     1670           
  Misses         468      468

Impacted Files	Coverage Δ
apps/snitch_core/lib/core/data/model/product.ex	97.08% <100%> (ø)	:arrow_up:

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