fix(configuration): improve the technique for removing '| null' on types due to 'null' fallbacks used in the JSON Schema (#6662)

Co-authored-by: Marylia Gutierrez <maryliag@gmail.com>

Author: trentm

experimental/CHANGELOG.md

@@ -19,6 +19,7 @@ For notes on migrating to 2.x / 0.200.x see [the upgrade guide](doc/upgrade-to-2
 * fix(configuration): improve how 'additionalProperties' in JSON schema is translated to TS types [#6650](https://github.com/open-telemetry/opentelemetry-js/pull/6650) @trentm
 * fix(configuration): remove stripMinItems and preprocessNullArrays from validation/parsing [#6657](https://github.com/open-telemetry/opentelemetry-js/pull/6657) @trentm
 * fix(configuration): improve handling of enums in generated types [#6659](https://github.com/open-telemetry/opentelemetry-js/pull/6659) @trentm
+* fix(configuration): improve the technique for removing '| null' on types the JSON Schema [#6662](https://github.com/open-telemetry/opentelemetry-js/pull/6662) @trentm
 * fix(sampler-jaeger-remote): add missing axios dep [#6656](https://github.com/open-telemetry/opentelemetry-js/pull/6656) @trentm
 
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