chore: Add cloud.resource_id for Azure AppServices.

[jaffinito]

Description

For Azure Entity Relationships. We need the resource id for building the relationship from the AppService site and the AppService plan (apm <> infra).

Adds a new vendor model called azureappservice that has a single entry called "cloud.resource_id". It uses a set of three env vars to synthesize the id: WEBSITE_OWNER_NAME, WEBSITE_RESOURCE_GROUP, and WEBSITE_SITE_NAME.

Includes unit tests.

Author Checklist

• Unit tests, Integration tests, and Unbounded tests completed
• Performance testing completed with satisfactory results (if required)

Reviewer Checklist

• Perform code review
• Pull request was adequately tested (new/existing tests, performance tests)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.15%. Comparing base (2a58163) to head (085f634).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3152      +/-   ##
==========================================
+ Coverage   82.14%   82.15%   +0.01%     
==========================================
  Files         485      486       +1     
  Lines       31104    31130      +26     
  Branches     3546     3549       +3     
==========================================
+ Hits        25549    25575      +26     
  Misses       4730     4730              
  Partials      825      825              

Flag	Coverage Δ
Agent	83.42% <100.00%> (+0.01%)	⬆️
Profiler	70.23% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...c/Agent/Core/Configuration/DefaultConfiguration.cs	89.63% <100.00%> (+<0.01%)	⬆️
.../Agent/Core/Configuration/ReportedConfiguration.cs	95.52% <100.00%> (+0.01%)	⬆️
...ent/Core/Utilization/AzureAppServiceVendorModel.cs	100.00% <100.00%> (ø)
...gent/NewRelic/Agent/Core/Utilization/VendorInfo.cs	90.56% <100.00%> (+0.56%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.