feat: allow generating css sourcemaps

[anema-eightfold]

SUMMARY

Allow generating proper SCSS/CSS sourcemaps

GITHUB ISSUE (Open Source Contributors)

JIRA TASK (Eightfold Employees Only):

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Build octuple with GENERATE_SOURCEMAPS=1 yarn run build:webpack command & it should pass

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.66%. Comparing base (254ccfc) to head (69779fc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #891   +/-   ##
=======================================
  Coverage   84.66%   84.66%           
=======================================
  Files        1099     1099           
  Lines       20416    20416           
  Branches     7718     7718           
=======================================
  Hits        17285    17285           
  Misses       3044     3044           
  Partials       87       87           

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