[SVLS-8161] Update Azure Function metadata detection logic

[kathiehuang]

What does this PR do?

If we're in an Azure Function on the flex consumption plan, set aas.resource.group to the DD_AZURE_RESOURCE_GROUP env var.

Motivation

• We are currently adding support for profiling in Azure Functions, but the aas.resource.group tag in profiles for Node.js Azure Functions on the Flex Consumption Plan is currently being set to flex
  • This is because Flex Consumption functions don't have a WEBSITE_RESOURCE_GROUP env var, and the structure of the WEBSITE_OWNER_NAME env var is different from all other Azure Function hosting plans. As a result, we ask customers to manually set DD_AZURE_RESOURCE_GROUP as an app setting
• Consistent with libdatadog changes made here
  • See related ticket here

Testing

• Deployed a Flex Consumption function and saw the correct aas.resource.group

Deployed a Node.js Windows Web App with the site extension, a Linux Web App with sidecar, and a Azure Container App to make sure this doesn't affect their profile tags

How to test

1. From this branch, run npm pack
2. Move the newly created .tgz file to the root of your app directory
3. Update package.json to have the tracer point to this file: "dd-trace": file:<name_of_tgz_file>
4. If deploying a Windows Web App with the site extension, also add an env var NODE_PATH=C:\home\site\wwwroot\node_modules. If deploying apps using in-process, update the Dockerfile to also copy the .tgz file before it runs npm ci

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.87%. Comparing base (e9493e1) to head (293e799).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7100      +/-   ##
==========================================
- Coverage   84.76%   83.87%   -0.90%     
==========================================
  Files         521      521              
  Lines       22151    22153       +2     
==========================================
- Hits        18776    18580     -196     
- Misses       3375     3573     +198     

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[github-actions]

Overall package size

Self size: 4.34 MB
Deduped: 5.22 MB
No deduping: 5.22 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 1.15.0 | 127.66 kB | 856.24 kB | | dc-polyfill | 0.1.10 | 26.73 kB | 26.73 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-12-16 22:29:43

Comparing candidate commit 293e799 in PR branch kathie.huang/SVLS-8161/update-azure-function-metadata-logic with baseline commit e9493e1 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 290 metrics, 30 unstable metrics.

[kathiehuang]

@codex review

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