Revert last canary flag PR and use a better method (#5535)

* Revert "Implement Labrinth Canary API flag (#5531)"

This reverts commit 3b21944a75.

* Use Labrinth-Canary header instead of cookie for API canary

* prepr

* fix rebase

apps/frontend/src/helpers/api.ts

@@ -2,9 +2,7 @@ import {
 	type AbstractFeature,
 	type AuthConfig,
 	AuthFeature,
-	CanaryCookieFeature,
 	CircuitBreakerFeature,
-	LABRINTH_CANARY_COOKIE,
 	NodeAuthFeature,
 	nodeAuthState,
 	NuxtCircuitBreakerStorage,
@@ -30,11 +28,7 @@ export function createModrinthClient(
 	auth: Ref<{ token: string | undefined }>,
 	config: { apiBaseUrl: string; archonBaseUrl: string; rateLimitKey?: string },
 ): NuxtModrinthClient {
-	const flags = useFeatureFlags()
 	const optionalFeatures = [
-		new CanaryCookieFeature({
-			getCookie: () => (flags.value.labrinthApiCanary ? LABRINTH_CANARY_COOKIE : undefined),
-		}) as AbstractFeature,
 		import.meta.dev ? (new VerboseLoggingFeature() as AbstractFeature) : undefined,
 	].filter(Boolean) as AbstractFeature[]