Logging environment value of LocalSitePackagesPath in RunFromPackageHandler

[surgupta-msft]

Issue describing the changes in this PR

resolves https://dev.azure.com/azfunc/internal/_workitems/edit/4428

Pull request checklist

IMPORTANT: Currently, changes must be backported to the in-proc branch to be included in Core Tools and non-Flex deployments.

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

Additional information

Adding a log to check whether any component is setting the environment variable "LocalSitePackagesPath" to a value other than "/local/sitepackages".

[Copilot]

Pull request overview

This pull request adds diagnostic logging to track the LocalSitePackages environment variable value and the resolved path used during package deployment on Linux containers. This helps troubleshoot configuration issues in Azure Functions runtime specialization.

• Adds logging to record both the environment variable value and the resolved path
• Refactors the environment variable retrieval logic to separate the raw value from the resolved value