Error when using "notify" key in steps within a group

[aelindeman]

The monorepo-diff plugin fails to parse the given pipeline config when there are notify keys in steps in a group. E.g. given this valid pipeline configuration:

steps:
  - label: ":pipeline:"
    plugins:
      - monorepo-diff#v1.5.1:
          watch:
            - path:
                - foo/**
              config:
                group: "Foo"
                steps:
                  - command: ./scripts/a.sh
                    label: "Run A"
                    notify:
                      - github_commit_status:
                          context: "buildkite/foo/a"
                  - command: ./scripts/b.sh
                    label: "Run B"
                    notify:
                      - github_commit_status:
                          context: "buildkite/foo/b"

Running the pipeline results in an error (with Buildkite agent v3.107.2):

DEBU[2025-10-28T14:34:56Z]
command = 'buildkite-agent',
args = '[pipeline upload /tmp/bmrd-2550478102 --no-interpolation]',
error = '2025-10-28 14:34:55 INFO   Reading pipeline configs from ["/tmp/bmrd-2550478102"]
2025-10-28 14:34:56 ERROR  Unrecoverable error, skipping retries
buildkite-agent: fatal: Failed to upload and process pipeline: Pipeline upload rejected: `rawnotify` is not a valid property on the `command` step, perhaps you meant `notify`?
'
FATA[2025-10-28T14:34:56Z] +++ failed to upload pipeline: command `buildkite-agent` failed: exit status 1
🚨 Error: The command exited with status 1

This seems to be because the part of the plugin that parses the config object changes the notify keys to rawnotify:

DEBU[2025-10-28T14:34:55Z] Output from diff:
.buildkite/pipeline.yaml
Generated Pipeline:
steps:
    - group: 'Foo'
      steps:
        - label: 'Run A'
          command: ./scripts/a.sh
          rawnotify:
            - github_commit_status:
                context: buildkite/foo/a
        - label: 'Run B'
          command: ./scripts/b.sh
          rawnotify:
            - github_commit_status:
                context: buildkite/foo/b