Add global namespace test

[jamescourtney]

Fix for #406

[codecov]

Codecov Report

Merging #409 (d860446) into main (0fe45ca) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #409   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files         125      125           
  Lines        9678     9678           
  Branches      786      786           
=======================================
  Hits         9422     9422           
  Misses        165      165           
  Partials       91       91           

Files	Coverage Δ
src/FlatSharp.Compiler/CloneMethodsGenerator.cs	92.98% <100.00%> (ø)
...FlatSharp.Compiler/SchemaModel/TableSchemaModel.cs	100.00% <100.00%> (ø)

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