datadog-ci adds ppdb-symbols upload for .NET MAUI
When uploading .NET MAUI Portable PDBs for managed C# exception symbolication, set `DATADOG_API_KEY` in the environment or `apiKey` in `datadog-ci.json`. Run `datadog-ci ppdb-symbols upload <location> --debug-id-manifest <path>` with the build-time manifest from `dd-sdk-maui`.
datadog-ci ppdb-symbols upload <location> --debug-id-manifest <path>