[Code Origin] Fix smoke test path mismatches on macOS and Windows IIS (#8659)

## Summary of changes

- Add `/p:PathMap=$(smokeTestAppDir)=/src` to the macOS smoke-test
publish step in `.azure-pipelines/ultimate-pipeline.yml`, mirroring the
`PathMap` already used by every Linux/Windows smoke-test Dockerfile.
- Update
`tracer/build/smoke_test_snapshots/smoke_test_iis_snapshots.json` so
`_dd.code_origin.frames.0.file` is `/src/ValuesController.cs` (the value
the Windows IIS Fleet Dockerfile actually emits).

## Reason for change

- After #8272 (Code Origin on by default), `smoke_macos_tool_tests`
failed on master for all 13 `macos*` jobs because the macOS pipeline
builds `AspNetCoreSmokeTest` directly on the host (no Docker, no
`PathMap`), so PDB sequence points contained
`/Users/runner/work/1/s/tracer/test/test-applications/regression/AspNetCoreSmokeTest/ValuesController.cs`
instead of the snapshot's expected `/src/ValuesController.cs`.
- The same PR added `/p:PathMap=C:\src=/src` to
`smoke.windows.iis.fleet-installer.dockerfile`, so the runtime now emits
`/src/ValuesController.cs`, but `smoke_test_iis_snapshots.json` was
approved with `C:\\src\\ValuesController.cs`, breaking
`smoke_win_fleet_tests`.

## Implementation details

- macOS: `$(smokeTestAppDir)` resolves to
`$(System.DefaultWorkingDirectory)/tracer/test/test-applications/regression/AspNetCoreSmokeTest`,
so `PathMap=$(smokeTestAppDir)=/src` rewrites every embedded source path
under that directory to `/src/...`. This matches the layout produced by
the Linux `WORKDIR /src` Dockerfiles, keeping a single shared
`smoke_test_snapshots.json` for all Linux/macOS smoke tests.
- IIS: only `WindowsFleetInstallerIisScenario` reads
`smoke_test_iis_snapshots`, and its Dockerfile already applies
`PathMap=C:\src=/src`, so updating the snapshot to
`/src/ValuesController.cs` aligns the expected value with actual runtime
output rather than re-introducing a divergent path.
- No tracer code or runtime behavior changes; this is purely a
CI/snapshot fix limited to two files (`+2 / -2`).

Author: dudikeleti

.azure-pipelines/ultimate-pipeline.yml

@@ -5543,7 +5543,7 @@ stages:
 
         - script: |
             cd $(smokeTestAppDir)
-            dotnet publish "AspNetCoreSmokeTest.csproj" -c Release --framework $(publishFramework) -o $(smokeTestAppDir)/publish
+            dotnet publish "AspNetCoreSmokeTest.csproj" -c Release --framework $(publishFramework) /p:PathMap=$(smokeTestAppDir)=/src -o $(smokeTestAppDir)/publish
           displayName: Build app
           failOnStderr: true
 

tracer/build/smoke_test_snapshots/smoke_test_iis_snapshots.json

@@ -133,7 +133,7 @@
         "_dd.code_origin.frames.0.index": "0",
         "_dd.code_origin.frames.0.method": "Get",
         "_dd.code_origin.frames.0.type": "AspNetCoreSmokeTest.ValuesController",
-        "_dd.code_origin.frames.0.file": "C:\\src\\ValuesController.cs",
+        "_dd.code_origin.frames.0.file": "/src/ValuesController.cs",
         "_dd.code_origin.frames.0.line": "19",
         "_dd.code_origin.frames.0.column": "13"
       },