* Add copilot-requests permission gated by feature flag
This add a new 'copilot-requests' permission to the workflow schema,
gated behind the 'allowCopilotRequestsPermission' experimental
feature flag.
When the flag is disabled (default), `copilot-requests` is filtered
out of autocomplete suggestions. When enabled, it appears
alongside other permissions like actions, contents, pull-requests,
etc.
* Update workflow-parser/src/workflow-v1.0.json
* Add additional unit test coverage
* Fix formatting
