Fix unit and function test builds

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier
• Unit or Functional tests are included in the PR

Description:

Ensure that undefined and null plugins are filtered correctly for test builds and use the manifest plugin for all builds to ensure the logger reports the correct bundle details.

Resolves #241

[codecov]

Codecov Report

Merging #240 into master will decrease coverage by 0.07%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #240      +/-   ##
==========================================
- Coverage   52.75%   52.67%   -0.08%     
==========================================
  Files          10       10              
  Lines         618      617       -1     
  Branches      155      155              
==========================================
- Hits          326      325       -1     
  Misses        292      292

Impacted Files	Coverage Δ
src/dist.config.ts	30.64% <ø> (-1.11%)	⬇️
src/dev.config.ts	20% <ø> (-1.43%)	⬇️
src/base.config.ts	23.16% <100%> (+0.43%)	⬆️
src/base.test.config.ts	13.79% <50%> (ø)	⬆️

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