Fix Upstream Service Mapping

[zARODz11z]

What does this PR do?

Fixes inferred spans service mapping by using service.name

Motivation

See SLS-4019 for more context, upstream service mapping not working in JS due to not using service.name

Testing Guidelines

Additional Notes

Types of Changes

• [x] Bug fix
• [ ] New feature
• [ ] Breaking change
• [ ] Misc (docs, refactoring, dependency upgrade, etc.)

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• [x] This PR's description is comprehensive
• [ ] This PR contains breaking changes that are documented in the description
• [ ] This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• [ ] This PR impacts documentation, and it has been updated (or a ticket has been logged)
• [x] This PR's changes are covered by the automated tests
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• [x] This PR passes the integration tests (ask a Datadog member to run the tests)