Decouple use of otel/internal/internaltest

[MrAlias]

Part of #3846

• Add the otel/internal/internaltest package as templates to otel/internal/shared
• Generate local internaltest packages for all uses outside of the otel module:
  • sdk
  • exporters/jaeger
  • exporters/zipkin
• Use the local internaltest for the packages with a generated copy

[codecov]

Codecov Report

Merging #4424 (d71e7f3) into main (e3ed198) will decrease coverage by 2.3%.
The diff coverage is 48.6%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4424     +/-   ##
=======================================
- Coverage   83.5%   81.2%   -2.3%     
=======================================
  Files        229     247     +18     
  Lines      18679   19996   +1317     
=======================================
+ Hits       15605   16246    +641     
- Misses      2755    3407    +652     
- Partials     319     343     +24     

Files Changed	Coverage Δ
...xporters/jaeger/internal/internaltest/alignment.go	0.0% <0.0%> (ø)
exporters/jaeger/internal/internaltest/errors.go	0.0% <0.0%> (ø)
exporters/jaeger/internal/internaltest/harness.go	0.0% <0.0%> (ø)
...xporters/zipkin/internal/internaltest/alignment.go	0.0% <0.0%> (ø)
exporters/zipkin/internal/internaltest/errors.go	0.0% <0.0%> (ø)
exporters/zipkin/internal/internaltest/harness.go	0.0% <0.0%> (ø)
internal/internaltest/alignment.go	0.0% <ø> (ø)
internal/internaltest/env.go	73.8% <ø> (ø)
internal/internaltest/errors.go	0.0% <ø> (ø)
internal/internaltest/harness.go	0.0% <ø> (ø)
... and 14 more

... and 2 files with indirect coverage changes