Remove experimental flag for case function

[AllanGuigou]

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[Copilot]

Pull request overview

This PR removes the experimental gating for the case() expression function so it is always available in expression completions, and cleans up related feature-flag plumbing and tests.

Changes:

• Removed the allowCaseFunction experimental feature flag from @actions/expressions feature flags.
• Updated expression completion APIs and the language service to no longer pass feature flags for completion filtering.
• Updated completion tests to expect case unconditionally and removed the “disabled” scenario.

Reviewed changes

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

Show a summary per file

File	Description
languageservice/src/complete.ts	Stops passing feature flags into expression completion; uses the simplified completion API.
languageservice/src/complete.test.ts	Updates completion tests to always include case; removes flag-specific setup and the “disabled” test.
languageservice/src/complete.expressions.test.ts	Removes FeatureFlags usage from expression completion tests while still asserting case is present.
expressions/src/features.ts	Removes allowCaseFunction from ExperimentalFeatures and from the known feature key list.
expressions/src/features.test.ts	Updates expectations for enabled feature lists after removing allowCaseFunction.
expressions/src/completion.ts	Removes feature-flag parameter and filtering from expression completion so case is always suggested.

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