Replace declarative config bridge usages in contrib

[zeitlinger]

Blocked by open-telemetry/opentelemetry-java-instrumentation#19220

Summary

• replace the remaining contrib DeclarativeConfigPropertiesBridgeBuilder usages in span-stacktrace and inferred-spans
• switch those modules to the new ConfigPropertiesBackedConfigProvider access-path API
• keep the declarative config access in inferred-spans on flat underscore keys
• remove duplicated duration parsing by using DeclarativeConfigPropertiesDurationUtil.parseDuration(...)

Why

DeclarativeConfigPropertiesBridge is being deprecated in opentelemetry-java-instrumentation, and these remaining contrib usages need to move off it first.

This change depends on open-telemetry/opentelemetry-java-instrumentation#19220, which supersedes #15835 and adds the bridge helpers used here.

Related deprecation PR: open-telemetry/opentelemetry-java-instrumentation#19202

The unrelated SamplingProfilerTest flake fix was split into #3000.

How this uses the new bridge APIs

• inferred-spans bridges the component root directly to otel.inferred.spans. with ConfigPropertiesBackedConfigProvider.builder().setAccessPath("", "otel.inferred.spans.")
• span-stacktrace bridges the component root directly to otel.java.experimental.span-stacktrace. the same way
• both modules use DeclarativeConfigPropertiesDurationUtil.parseDuration(...) instead of carrying their own parsing copy

Breaking behavior change

Declarative config YAML now only accepts integer millisecond values for these duration properties.

Examples:

• supported: min_duration: 100
• not supported in declarative YAML anymore: min_duration: 100ms

That matches the behavior documented on DeclarativeConfigPropertiesDurationUtil: flat ConfigProperties inputs can still use string durations such as 42ms, but non-ConfigProperties declarative config only accepts integer milliseconds.

Testing

• GRADLE_USER_HOME=/tmp/gradle-home-otel-java-contrib ./gradlew --no-build-cache --no-configuration-cache -PuseLocalMaven :span-stacktrace:check :inferred-spans:check