[api-logs] remove `NOOP_LOGGER_PROVIDER` and `NoopLoggerProvider` export

[pichlermarc]

Description

We don't need to export NOOP_LOGGER_PROVIDER and NoopLoggerProvider according to the Logs API specification, so it's best we remove them before integrating the package in to @opentelemetry/api

This issue is considered done when

• exports have been removed here:

  opentelemetry-js/experimental/packages/api-logs/src/index.ts

  Line 24 in 7a9b049

  export { NOOP_LOGGER_PROVIDER, NoopLoggerProvider } from './NoopLoggerProvider';