[receiver/elasticapm]Fix benchmarks to produce correct IDs

[lahsivjar]

Fix a few remaining issues from #1214

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Enterprise

Run ID: 2dab8b65-aaf7-4d35-b6cc-379ff095b913

📥 Commits

Reviewing files that changed from the base of the PR and between 6937934 and a4c6568.

📒 Files selected for processing (2)

• receiver/elasticapmintakereceiver/receiver_bench_test.go
• receiver/elasticapmintakereceiver/resource_grouping.go

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📝 Walkthrough

Walkthrough

This PR refactors the mixed-workload benchmark's synthetic ID generation to use zero-padded hex formatting (e.g., %016x, %032x) derived from numeric sequences instead of prefixed patterns, and updates the resource fingerprinting comment to clarify that the computation depends on deterministic attribute visitation order while the key inclusion prevents value-sequence ambiguity.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

• 🛠️ Update Documentation

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.2)

level=error msg="[linters_context] typechecking error: pattern ./...: directory prefix . does not contain main module or its selected dependencies"

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