Use the entry name for externals based on single bundle config

[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:

Switch the entry name for externals based on the type of build.

[codecov]

Codecov Report

Merging #237 into master will increase coverage by 3.99%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #237      +/-   ##
=========================================
+ Coverage    52.6%   56.6%   +3.99%     
=========================================
  Files          10      10              
  Lines         614     689      +75     
  Branches      154     178      +24     
=========================================
+ Hits          323     390      +67     
- Misses        291     299       +8

Impacted Files	Coverage Δ
src/base.config.ts	22.72% <0%> (-0.13%)	⬇️
src/main.ts	90.57% <0%> (-0.02%)	⬇️

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