Add action.yml support and update language service to 0.3.33

[ericsciple]

• Add ActionSelector pattern for action.{yml,yaml} files
• Update @actions/languageservice and @actions/languageserver to 0.3.33

[Copilot]

Pull request overview

This PR adds language server support for GitHub Actions action definition files (action.yml and action.yaml) and updates the @actions/languageserver and @actions/languageservice dependencies to version 0.3.33. The package is also renamed from @github/vscode-github-actions to vscode-github-actions (removing the scoped namespace) and the version is bumped to 0.29.0.

Key changes:

• Added ActionSelector document selector pattern to enable language server features for action definition files
• Updated language service dependencies to 0.3.33 with numerous bug fixes and feature enhancements
• Changed package name from scoped to unscoped format

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/workflow/languageServer.ts	Import and use the new ActionSelector alongside WorkflowSelector in the language client configuration
src/workflow/documentSelector.ts	Define ActionSelector pattern to match action.yml/action.yaml files in any directory
package.json	Update package name, bump version to 0.29.0, update dependencies to 0.3.33
package-lock.json	Sync lockfile with package.json dependency updates and package name change
CHANGELOG.md	Document the new features and dependency updates for version 0.29.0

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