chore: use TelemetryResourceDetector for telemetry sdk values when creating default resource

[the-wondersmith]

PR removes the need to manually keep pinned version of opentelemetry-sdk in sync with static string value in runtime/src/telemetry.rs

Credit: lalitb's suggestion here

[greptile-apps]

PR Summary

This PR improves telemetry setup in the Shuttle runtime by automating SDK version tracking and simplifying resource creation.

• Uses TelemetryResourceDetector to automatically provide SDK telemetry values instead of manual version strings in runtime/src/telemetry.rs
• Aligns opentelemetry_sdk version to 0.27.0 in runtime/Cargo.toml to match other OpenTelemetry dependencies
• Simplifies resource creation by merging auto-detected SDK information with custom attributes

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