Fix dotnet-test integration tests related to dotnet core 3.1+ on Windows

[brandongregoryscott]

Fixes #107 dotnet-test command integration tests fail locally w/ .NET Core 3.1.x [Windows]

• Merge all env variables from host with overrides vs. manual subset which breaks dotnet core 3.1 on Windows
  • Honestly not 100% sure what environment variable(s) might be breaking the dotnet package restore process, but it was reproducible before and after changing the way the env variables are setup for the spawned process

~Update Travis config to run on multiple operating systems to prevent cross-platform regressions~

~It looks like we may have been unintentionally using Travis job "stages" which run sequentially. The current setup keeps each class of test (unit, integration) and operating system as separate jobs which can run in parallel. The Windows and macOS integration test jobs take the longest, but should be around 5-6 minutes.~

• Update flaky github module test and add RepositoryFactory

---

• [x] Related GitHub issue(s) linked in PR description
• [x] Destination branch merged, built and tested with your changes
• [x] Code formatted and follows best practices and patterns
• [x] Code builds cleanly (no additional warnings or errors)
• [x] Manually tested
• [x] Automated tests are passing
• [x] No decreases in automated test coverage
• [-] Documentation updated (readme, docs, comments, etc.)
• [-] Localization: No hard-coded error messages in code files (minimally in string constants)

[codecov[bot]]

Codecov Report

Merging #161 (53803d0) into main (b2aa8a7) will increase coverage by 0.17%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
+ Coverage   74.82%   75.00%   +0.17%     
==========================================
  Files          39       40       +1     
  Lines        1426     1436      +10     
  Branches      262      262              
==========================================
+ Hits         1067     1077      +10     
  Misses        349      349              
  Partials       10       10              

Impacted Files	Coverage Δ
src/tests/factories/factory-type.ts	100.00% <ø> (ø)
src/tests/test-utils.ts	29.62% <ø> (ø)
src/tests/factories/index.ts	100.00% <100.00%> (ø)
src/tests/factories/repository-factory.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update b2aa8a7...1215f68. Read the comment docs.