Fix for API tests, Simplify Targets

[ChrisPulman]

What kind of change does this PR introduce?

Fix for API tests

What is the current behavior?

API tests do not fail

What is the new behavior?

API tests now fail if change is recognised
Simplified targets into mostly a single location for updates

What might this PR break?

Non expected, but part of a breaking change overall

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (f63a155) 74.06% compared to head (a6697e2) 69.79%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/Splat/ServiceLocation/InternalLocator.cs	10.00%	9 Missing ⚠️
src/Splat/TargetFrameworkExtensions.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1066      +/-   ##
==========================================
- Coverage   74.06%   69.79%   -4.28%     
==========================================
  Files          95       95              
  Lines        5530     4609     -921     
  Branches      632      633       +1     
==========================================
- Hits         4096     3217     -879     
+ Misses       1230     1186      -44     
- Partials      204      206       +2     

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[github-actions]

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