Wrap webhook payload dict to avoid collisions

[paulbarfuss]

What does this PR do?

Moves the webhook payload into its own dict rather than top level:

Before:

project:
  avatar_url: null
  ci_config_path: null
  default_branch: master
  description: ''
  git_http_url: >-
    https://example.com/example/repo.git

After:

webhook_payload:
  project:
    avatar_url: null
    ci_config_path: null
    default_branch: master
    description: ''
    git_http_url: >-
      https://example.com/example/repo.git

Note that this only affects the new ansible-runner plugin and not any other existing config scripts or automation playbooks.

People to notify

cc: @redhat-cop/tool-integrations

[jacobsee]

LGTM