feat(events): add 'tutorial skipped' default event (ST-286)

[iav-uk]

No description provided.

[linear-code]

ST-286

[Copilot]

Pull request overview

Adds first-class support for marking tutorials as skipped, exposing the capability across the public API surface (Go interfaces, protobuf/OpenAPI), and introducing a corresponding analytics/publisher event.

Changes:

• Extend TutorialsSystem with a Skip(...) method and introduce a TUTORIAL_STATE_SKIPPED state.
• Add a new RPC (RPC_ID_TUTORIALS_SKIP) plus TutorialSkipRequest to protobuf and OpenAPI.
• Add a new publisher event constructor (tutorialSkipped) and document the change in the changelog.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tutorials.go	Adds Skip(...) to the exported TutorialsSystem interface.
hiro.proto	Adds RPC id, request message, and tutorial state for “skipped”.
hiro-openapi.yml	Exposes the new tutorials skip RPC endpoint and schemas.
events_satori.go	Adds a new tutorialSkipped publisher event constructor.
CHANGELOG.md	Documents the new skip functionality/event under Unreleased.

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