Remove development-only files from Next.js deployments

[leoortizz]

Description

Remove development-only files from deployed files. Closes #6715

Scenarios Tested

see test case added in 1f579d7601b63a0d3d9f3da5e7f3afb27f89cdfb

Sample Commands

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 20.00000% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 54.56%. Comparing base (cecf08b) to head (b6b946d).

Files	Patch %	Lines
src/frameworks/next/utils.ts	28.57%	5 Missing :warning:
src/frameworks/next/index.ts	0.00%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6731      +/-   ##
==========================================
- Coverage   54.56%   54.56%   -0.01%     
==========================================
  Files         355      355              
  Lines       24723    24731       +8     
  Branches     5107     5108       +1     
==========================================
+ Hits        13490    13494       +4     
- Misses      10013    10017       +4     
  Partials     1220     1220              

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[jamesdaniels]

Would be great if we didn't copy those files to start with but that would probably make the code more complex, wdyt?

[leoortizz]

Would be great if we didn't copy those files to start with but that would probably make the code more complex, wdyt?

indeed, I can make that change. I thought it would be slower than just removing the files but it's probably similar