chore: rename flag to disable template insights (#21329)

Because this affects more than just the template insights
page (specifically it also affects the deployment stats endpoint which
is shown on bottom bar and Prometheus), the group is being renamed
generically to just "stats collection".  In the future if we need to
affect the other stats we can put those options here.

Then, because this change only affects a portion of stats, specifically
usage stats like connection and application time, bytes sent, etc, add a
new sub-group called "usage stats".

Then finally add back the "enable" flag.  This also gives us a place to
one day place an "anonymize" flag if we need to go that route.

site/src/api/typesGenerated.ts

@@ -1783,7 +1783,7 @@ export interface DeploymentValues {
 	readonly workspace_prebuilds?: PrebuildsConfig;
 	readonly hide_ai_tasks?: boolean;
 	readonly ai?: AIConfig;
-	readonly template_insights?: TemplateInsightsConfig;
+	readonly stats_collection?: StatsCollectionConfig;
 	readonly config?: string;
 	readonly write_config?: boolean;
 	/**
@@ -4593,6 +4593,11 @@ export interface SlimRole {
 	readonly organization_id?: string;
 }
 
+// From codersdk/deployment.go
+export interface StatsCollectionConfig {
+	readonly usage_stats: UsageStatsConfig;
+}
+
 // From codersdk/client.go
 /**
  * SubdomainAppSessionTokenCookie is the name of the cookie that stores an
@@ -5105,11 +5110,6 @@ export interface TemplateGroup extends Group {
 	readonly role: TemplateRole;
 }
 
-// From codersdk/deployment.go
-export interface TemplateInsightsConfig {
-	readonly enable: boolean;
-}
-
 // From codersdk/insights.go
 /**
  * TemplateInsightsIntervalReport is the report from the template insights
@@ -5677,6 +5677,11 @@ export interface UsagePeriod {
 	readonly end: string;
 }
 
+// From codersdk/deployment.go
+export interface UsageStatsConfig {
+	readonly enable: boolean;
+}
+
 // From codersdk/users.go
 /**
  * User represents a user in Coder.