do not output plugin warning for sample rxconfig

[adhami3310]

No description provided.

[greptile-apps]

Greptile Summary

This PR introduces a mechanism to suppress plugin warnings when creating default/sample configurations in the Reflex framework. The changes add a new private field _skip_plugins_checks to the BaseConfig class that allows the framework to distinguish between actual user configurations and temporary configurations created during initialization or testing.

The implementation works by:

1. Adding _skip_plugins_checks: bool as a private dataclass field that defaults to False
2. Modifying the _post_init method to conditionally call _add_builtin_plugins() only when _skip_plugins_checks is False
3. Setting _skip_plugins_checks=True when creating the default config in _get_config() when no rxconfig.py file is found

This change addresses a user experience issue where plugin warnings would appear during reflex init commands or in test environments before a proper rxconfig.py file exists. The warnings were confusing in these contexts because they related to built-in plugins that users hadn't explicitly configured yet. By skipping plugin checks for sample configurations, the framework maintains helpful warnings for real user configs while eliminating noise during setup and testing scenarios.

The change integrates cleanly with the existing configuration system, leveraging the dataclass architecture already in place and using a clear flag-based approach to control behavior.

Confidence score: 4/5

• This PR is safe to merge with low risk as it addresses a UX issue without breaking existing functionality
• Score reflects well-targeted changes that solve a specific problem without affecting core logic paths
• Pay close attention to the conditional logic in _post_init to ensure plugin loading behavior remains correct

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[codspeed-hq]

CodSpeed Performance Report

Merging #5715 will not alter performance

_{Comparing do-not-output-plugin-warning-for-sample-rxconfig (602c353) with main (948b993)}

Summary

✅ 8 untouched benchmarks