Allow int or float value for telemetry_heartbeat_interval telemetry configuration value

[mtoffl01]

Motivation

dd-trace-java stores the default value of telemetry_heartbeat_interval as an int, but resolves any configured values to a float. When DD_TELEMETRY_HEARTBEAT_INTERVAL=2 is set, dd-trace-java will report its value as 2.0 as expected.

This PR is blocking the Enhanced Config Telemetry effort in dd-trace-java (PR).

Changes

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added (or removed)?
  • Get a review from R&P team