move env helpers out of the config package (#24648)

go2rtc's create_config.py imported frigate.config.env, which ran the frigate.config package init and loaded every detector plugin. Since the onnxruntime 1.30 bump, importing onnxruntime takes about 5s on some hosts, so go2rtc started after Frigate's cameras and every ffmpeg process failed to connect to the restream until it came up. The env helpers now live in frigate.util.env, so go2rtc's config script no longer imports onnxruntime.

frigate/test/http_api/test_http_app.py

@@ -4,12 +4,12 @@ from unittest.mock import Mock, patch
 
 import frigate.genai
 from frigate.config import GenAIProviderEnum
-from frigate.config.env import FRIGATE_ENV_VARS
 from frigate.const import MODEL_CACHE_DIR, REDACTED_CREDENTIAL_SENTINEL
 from frigate.genai import GenAIClient
 from frigate.models import Event, Recordings, ReviewSegment
 from frigate.stats.emitter import StatsEmitter
 from frigate.test.http_api.base_http_test import AuthTestClient, BaseTestHttp
+from frigate.util.env import FRIGATE_ENV_VARS
 
 
 class TestHttpApp(BaseTestHttp):