Fix imports from build/src

[kdubb]

These imports directly import the CommonJS version instead of selecting via the package definition.

In angular these produce warnings about CommonJS packages.

[kdubb]

NoopTextMapPropagator is not explicitly exported so it was switch to esm considering this is specifically for Angular 13+.

[codecov]

Codecov Report

Merging #143 (279ad0e) into main (f0e6627) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #143   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines          332       335    +3     
  Branches        61        61           
=========================================
+ Hits           332       335    +3     

Impacted Files	Coverage Δ
...vices/exporter/otelcol/otelcol-exporter.service.ts	100.00% <100.00%> (ø)
...ext-propagator/noop-text-map-propagator.service.ts	100.00% <100.00%> (ø)
...ojects/opentelemetry-interceptor/src/public-api.ts	100.00% <0.00%> (ø)

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[jufab]

Hi @kdubb

Thanks for your contribution.

I just did a commit to fix unit test and remove NoopTextMapPropagator : return a null value have the same effect.