refactor(symfony): remove static state from EntrypointAction

[KevinMartinsDev]

Description

This Pull Request is the first step of the worker mode compatibility audit (see #7918). It addresses the usage of static properties for state persistence within Symfony Actions.

In persistent memory runtimes like FrankenPHP or Swoole, static properties persist across the entire process lifetime. In the case of EntrypointAction, storing the ResourceNameCollection in a static property is unnecessary since the service is already a singleton in the container.

Moving this to an instance property ensures:

• Cleanliness: Avoids global state within the process.
• Thread-safety: Better alignment with modern PHP runtime expectations.
• Consistency: Matches standard service-oriented architecture.

Changes

• Removed static scope from $resourceNameCollection in EntrypointAction.
• Updated __invoke to use instance-level lazy loading with the ??= operator.

Context

This fix is part of a global audit performed with Igor-PHP.

Part of #7918

[soyuka]

good catch thanks!