Autocomplete: Remove cody-autocomplete-streaming-response flag (#995)

Removing the feature flag, we've shipped this feature to 100% and now
it's time for enterprise customers to also get this goodie.

## Test plan

👀 

<!-- Required. See
https://docs.sourcegraph.com/dev/background-information/testing_principles.
-->

lib/shared/src/experimentation/FeatureFlagProvider.ts

@@ -9,7 +9,6 @@ export enum FeatureFlag {
 
     CodyAutocompleteTracing = 'cody-autocomplete-tracing',
     CodyAutocompleteIncreasedDebounceTimeEnabled = 'cody-autocomplete-increased-debounce-time-enabled',
-    CodyAutocompleteStreamingResponse = 'cody-autocomplete-streaming-response',
     CodyAutocompleteStarCoder7B = 'cody-autocomplete-default-starcoder-7b',
     CodyAutocompleteStarCoder16B = 'cody-autocomplete-default-starcoder-16b',
     CodyAutocompleteClaudeInstantInfill = 'cody-autocomplete-claude-instant-infill',

vscode/CHANGELOG.md

@@ -18,6 +18,7 @@ Starting from `0.2.0`, Cody is using `major.EVEN_NUMBER.patch` for release versi
 ### Changed
 
 - Remove `starter` and `premade` fields from the configuration files for custom commands (cody.json). [pull/939](https://github.com/sourcegraph/cody/pull/939)
+- Enabled streaming responses for all autocomplete requests. [pull/995](https://github.com/sourcegraph/cody/pull/995)
 
 ## [0.10.1]
 

vscode/src/completions/client.ts

@@ -38,12 +38,9 @@ export function createClient(
         async complete(params, onPartialResponse, signal): Promise<CompletionResponse> {
             const log = logger?.startCompletion(params)
 
-            const [tracingFlagEnabled, streamingResponseFlagEnable] = featureFlagProvider
-                ? await Promise.all([
-                      featureFlagProvider.evaluateFeatureFlag(FeatureFlag.CodyAutocompleteTracing),
-                      featureFlagProvider.evaluateFeatureFlag(FeatureFlag.CodyAutocompleteStreamingResponse),
-                  ])
-                : [false, false]
+            const tracingFlagEnabled = await featureFlagProvider?.evaluateFeatureFlag(
+                FeatureFlag.CodyAutocompleteTracing
+            )
 
             const headers = new Headers(config.customHeaders)
             // Force HTTP connection reuse to reduce latency.
@@ -62,8 +59,7 @@ export function createClient(
             // TODO(philipp-spiess): Feature test if the response is a Node or a browser stream and
             // implement SSE parsing for both.
             const isNode = typeof process !== 'undefined'
-
-            const enableStreaming = !!isNode && !!streamingResponseFlagEnable
+            const enableStreaming = !!isNode
 
             const url = getCodeCompletionsEndpoint()
             const response: Response = await fetch(url, {