Add static cache purge commands

[timkelty]

Adds explicit cloud/static-cache/purge-all, cloud/static-cache/purge-cdn, and cloud/static-cache/purge-origin commands. Purges run synchronously so failed gateway requests fail the command.

[Copilot]

Pull request overview

Adds a new CLI entrypoint to explicitly purge the static cache (origin, CDN, or both), ensuring invocations without an explicit selector fail fast instead of becoming a no-op. This fits into the existing Cloud CLI controller set and complements the existing purge-prefixes and purge-tags actions.

Changes:

• Added cloud/static-cache/purge with --all, --origin, and --cdn options and validation that at least one is provided.
• Implemented purge dispatching to StaticCache::purgeOrigin(), purgeCdn(), or purgeAll() depending on selected options.
• Added unit tests covering option registration, dispatch behavior, and missing-selector failure.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/cli/controllers/StaticCacheController.php	Adds the new purge action and registers the new CLI options for selecting which cache(s) to purge.
tests/unit/StaticCacheControllerTest.php	Adds unit coverage for the new purge command’s options, behavior, and required-selector validation.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.