Compile runtime-telemetry-java17 for java8

[laurit]

An alternative for #13678
#13393 had a small bug where it added a nested tasks element so the source version change didn't really apply

[trask]

how hard would it be to add a test?

[jeanbisutti]

Perhaps

opentelemetry-java-instrumentation/instrumentation/runtime-telemetry/runtime-telemetry-java17/library/build.gradle.kts

Line 6 in d5dad4a

minJavaVersionSupported.set(JavaVersion.VERSION_17)

could be removed

[laurit]

Perhaps

opentelemetry-java-instrumentation/instrumentation/runtime-telemetry/runtime-telemetry-java17/library/build.gradle.kts

Line 6 in d5dad4a

minJavaVersionSupported.set(JavaVersion.VERSION_17)

could be removed

the tests don't work on earlier java versions, this ensures that the tests are only run with java 17+

[laurit]

how hard would it be to add a test?

I don't know how to test this as with this change we wish to influence the gradle metadata of the starter module so that it wouldn't contain any reference to java17. It is probably possible to achieve this by modifying metadata like in https://docs.gradle.org/current/userguide/component_metadata_rules.html but changing the java version seemed easier and we already used the same approach for the webmvc6 instrumentation.