Pull request activity type missing (de)milestoned

[flying-sheep]

Describe the bug
Valid pull request event types include milestoned and demilestoned (like issue event types), but the schema doesn’t show them:

languageservices/workflow-parser/src/workflow-v1.0.json

Lines 821 to 841 in 4ddbbc9

	"pull-request-activity-type": {
	"allowed-values": [
	"assigned",
	"unassigned",
	"labeled",
	"unlabeled",
	"opened",
	"edited",
	"closed",
	"reopened",
	"synchronize",
	"converted_to_draft",
	"ready_for_review",
	"locked",
	"unlocked",
	"review_requested",
	"review_request_removed",
	"auto_merge_enabled",
	"auto_merge_disabled"
	]
	},

To Reproduce
Steps to reproduce the behavior:

1. Try to validate your valid workflow (it runs as expected when adding or removing a milestone)
2. see validation errors for the milestoned and demilestoned event

Expected behavior
milestoned and demilestoned are accepted as valid

Screenshots

Package/Area

• Expressions
• Workflow Parser
• Language Service
• Language Server

Package Version
v0.3.6

Additional context
The GitHub docs are also inconsistent here: The webhook docs list those event types but the workflow syntax docs don’t.

A said: It’s definitely valid. Using the event types works, part of the docs mention the event types, and clearly adding milestones to a PR is something you can do both with the API and the web UI.