Fix: Product details endpoint

[jkarenzi]

What does this PR do?

• This PR fixes issues in product details endpoint.

Description of the task to be completed

• Return total qty sold and similar products, which are needed on the frontend side

What are the relevant pivotal trackers?

• Fix: Get Product Details #154

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 86.34%. Comparing base (6121d7f) to head (530ab92).

Files	Patch %	Lines
src/controller/buyerController.ts	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #157      +/-   ##
===========================================
- Coverage    86.41%   86.34%   -0.07%     
===========================================
  Files           65       65              
  Lines         1759     1765       +6     
  Branches       193      193              
===========================================
+ Hits          1520     1524       +4     
- Misses         212      214       +2     
  Partials        27       27              

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[wayneleon1]

Looks good