DI: permit line number & method name at the same time

[p-datadog]

What does this PR do?

Loosens the restriction that line number and method name cannot be specified in a probe simultaneously.

Motivation:
Java and, shortly, Go provide the type name and method name for line probes. The use case in Go is to make line instrumentation feasible from the performance standpoint. Additionally, in all languages, having the type and method information for line probes permits (in theory) the library to verify that the line being instrumented is in the expected method, essentially verifying that the source code that the customer saw in UI when they selected the probe location matches the source code in the running application.

This PR brings Ruby DI implementation in alignment with Java and Go, so that if in the future backend starts sending type/method name with line probes, existing Ruby applications will not be broken.

Change log entry
None

Additional Notes:

How to test the change?
Unit tests altered

[github-actions]

Thank you for updating Change log entry section 👏

^{Visited at: 2025-09-24 15:32:40 UTC}

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 100.00%
• Total Coverage: 95.19%

View detailed report

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 8087c65 | Docs | Was this helpful? Give us feedback!}

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-09-24 15:55:36

Comparing candidate commit 8087c65 in PR branch di-probe-fields with baseline commit 8275ac0 in branch master.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 43 metrics, 2 unstable metrics.

scenario:profiling - intern_all 1000 repeated strings

• 🟩 throughput [+3949.412op/s; +4019.281op/s] or [+19.756%; +20.105%]