fix(server): Always apply cache debouncing for project states

[jan-auer]

Removes the is_local override for all project state sources for multiple reasons:

• Reduces pressure on the Redis source.
• Reduces pressure on the contended project cache actor and the project sources.
• Applies equivalent caching across all sources.

This has one negative effect: When updating a local file system configuration, Relay will wait for the configured project cache (soft) timeout until it applies this configuration.