One product_review per user

[Jeshan7]

Why?

• More than one number of users were able to add product_reviews.

This change addresses the need by:

In rating.ex(factory)

• Added a user

Created a migration for altering the product_reviews table Now user_id column is present in the snitch_product_reviews table Added test cases in the product_reviews schema

[delivers #163942461]

Checklist

• [ ] I have read CONTRIBUTING.md.
• [ ] My code follows the style guidelines of this project.
• [ ] I have commented on 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 #476 into develop will decrease coverage by 0.63%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #476      +/-   ##
===========================================
- Coverage    80.25%   79.62%   -0.64%     
===========================================
  Files          176      176              
  Lines         2218     2218              
===========================================
- Hits          1780     1766      -14     
- Misses         438      452      +14

Impacted Files	Coverage Δ
...core/lib/core/data/schema/review/product_review.ex	100% <100%> (ø)	:arrow_up:
.../snitch_core/lib/core/data/model/product_review.ex	51.61% <0%> (-45.17%)	:arrow_down:

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[ashish173]

We don't need this at the moment. @Jeshan7 thanks!