Fix npe in context bridging

[laurit]

Hopefully resolves #16342

Ran into this while debugging a kotlin issue where the problematic call originated from

opentelemetry-java-instrumentation/instrumentation/opentelemetry-extension-kotlin-1.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/extensionkotlin/v1_0/ContextExtensionInstrumentation.java

Lines 116 to 117 in 7e2f42a

	Context agentContext = ContextExtensionsKt.getOpenTelemetryContext(coroutineContext);
	return AgentContextStorage.toApplicationContext(agentContext);

How exactly it happens in #16342 is still a mystery.

[dtaveras]

@laurit @trask When will this fix be backported to for example the 2.23 release? We have an application where we are seeing the same issue and want to know when the fix will be published.

[trask]

hi @dtaveras! this will be included in our next monthly release, which is scheduled for end of next week.