Refactor Buildspec files

[Zuhal-Ayob]

Work done

• Refactor build spec
• Create frontend build spec for each environment
• Changed the deployment so it goes into each frontend environment

Tests

Does this PR include tests for the changes introduced?

• Yes
• No, I found it difficult to test
• No, they are not required for this change

[codeclimate]

Code Climate has analyzed commit 2f3333d and detected 0 issues on this pull request.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5f16265) 54.19% compared to head (2f3333d) 54.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##             test    #5984      +/-   ##
==========================================
- Coverage   54.19%   54.19%   -0.01%     
==========================================
  Files        1139     1139              
  Lines       37909    37909              
  Branches     5104     5104              
==========================================
- Hits        20545    20544       -1     
- Misses      12921    12922       +1     
  Partials     4443     4443              

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