Simplify sandbox store

[jakubno]

Simplify the sandbox store interface before we add redis store

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Note

Reworks sandbox store to use option-based queries and atomic updates, refactoring orchestrator, handlers, metrics, analytics, and eviction to the new API.

• Core sandbox store:
  • Introduces option-based querying via Items(options...) with ItemsFilter and helpers: WithTeamID, WithAllTeams, WithState, WithStates, WithOnlyExpired.
  • Adds atomic Update(sandboxID, updateFunc); removes ItemsByState, ItemsToEvict, ExtendEndTime from interface.
  • Adds NotFoundError.
• Memory store:
  • Implements Items with filtering and Update; removes old state-specific listing and TTL extension.
  • Adds applyFilter and minor log tweak.
• Orchestrator:
  • GetSandboxes now returns []sandbox.Sandbox and accepts store options.
  • Updates admin nodes/detail, analytics (long-running), status logging to use Items(WithAllTeams...) and/or state filters.
  • KeepAliveFor now performs TTL changes via sandboxStore.Update with explicit errors; updates orchestrator with new end time.
• Evictor:
  • Scans items to evict via Items(WithAllTeams(), WithOnlyExpired(true)).
• Handlers:
  • Update listing to new orchestrator GetSandboxes API; split running/pausing via filtering; import shared utils for filtering.
• Metrics:
  • Team observer uses cache.Items(WithAllTeams()) for per-team counts.

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[dobrac]

how about making this false by default?

[dobrac]

I think the WithIsExpired should be by default false