chore: remove deltaApiStreaming flag (#9362)

Author: sjaanus

src/lib/types/experimental.ts

@@ -61,7 +61,6 @@ export type IFlagKey =
     | 'streaming'
     | 'etagVariant'
     | 'deltaApi'
-    | 'deltaApiStreaming'
     | 'uniqueSdkTracking'
     | 'frontendHeaderRedesign'
     | 'dataUsageMultiMonthView'
@@ -297,10 +296,6 @@ const flags: IFlags = {
         process.env.UNLEASH_EXPERIMENTAL_DELTA_API,
         false,
     ),
-    deltaApiStreaming: parseEnvVarBoolean(
-        process.env.UNLEASH_EXPERIMENTAL_DELTA_API_STREAMING,
-        false,
-    ),
     uniqueSdkTracking: parseEnvVarBoolean(
         process.env.UNLEASH_EXPERIMENTAL_UNIQUE_SDK_TRACKING,
         false,